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Human sexuality may be viewed as a personality trait and is how people experience and express themselves as sexual beings. The study of human sexuality encompasses an array of social activities and an abundance of behaviors, actions, and societal topics. Biologically, sexuality can encompass sexual intercourse and sexual contact in all its forms, as well as medical concerns about the physiological or even psychological aspects of sexual behaviour. Sociologically, it can cover the cultural, political, and legal aspects; and philosophically, it can span the moral, ethical, theological, spiritual or religious aspects.
Recent studies on human sexuality have highlighted that sexual aspects are of major importance in building up personal identity and to social evolution of individuals:
“Human sexuality is not simply imposed by instinct or stereotypical conducts, as happens in animals, but it is influenced both by superior mental activity and by social, cultural, educational and normative characteristics of those places where the subjects grow up and their personality develops. Consequently, the analysis of sexual sphere must be based on the convergence of several lines of development such as affectivity, emotions and relations”. 
Biology and physiology
The biology of human sexuality examines the influence of biological factors, such as organic and neurological response, heredity, hormones, and sexual dysfunction; it examines the basic functions of reproduction and the physical means to carry it out. The biological perspective helps to analyze the factors, and ultimately aids in understanding them and using them to deal with sexual problems.
Sex as exercise burns calories to produce health benefits. Sex also relieves stress, boosts the immune system with higher levels of immunoglobulin A, improves cardiovascular health, increases self-esteem, improves intimacy, reduces pain by production of the hormone oxytocin, reduces the risk of prostate cancer, strengthens pelvic muscles, and promotes good sleep. Sex also improves the sense of smell and urinary bladder control.
Human sexuality can also be understood as part of the social life of humans, governed by implied rules of behavior and the status quo. This focus narrows the view to groups within a society. The sociocultural aspect examines influences on and from social norms, including media such as politics and the mass media. These sorts of media can help to bring about massive changes in the social norm — examples include the sexual revolution and the rise of feminism.
The link between constructed sex meanings and racial ideologies has been studied. Sexual meanings are constructed to maintain racial-ethnic-national boundaries, by denigration of "others" and regulation of sexual behavior within the group. "Both adherence to and deviation from such approved behaviors, define and reinforce racial, ethnic, and nationalist regimes."
- Main article: Sex education
Sex education is the introduction of sexual topics within an educational context. Almost all western countries have some form of sex education, but the nature varies widely. In some countries (such as Australia and much of Europe) "age-appropriate" sex education often begins in pre-school, whereas other countries leave sex education to the pre-teenage and teenage years.[How to reference and link to summary or text] Sex education covers a range of topics, including the physical, mental, and social aspects of sexual behavior.
The psychological study of sexuality focuses on psychological influences that affect sexual behavior and experiences. Early psychological analyses were carried out by Sigmund Freud, who believed in a psychoanalytic point of view. He also conjectured the concepts of erogenous zones, psychosexual development, and the Oedipus complex, among others.
Behavior theorists such as John B. Watson and B. F. Skinner examine the actions and consequences and their ramifications. These theorists would, for example, study a child who is punished for sexual exploration and see if they grow up to associate negative feelings with sex in general. Social-learning theorists use similar concepts, but focus on cognitive activity and modeling.
Gender identity is a person's own sense of identification as female, male, both, neither, or somewhere in between. The social construction of gender has been discussed by a wide variety of scholars, Judith Butler notable among them. Recent contributions consider the influence of feminist theory and courtship research  which are combined in Attraction Theory, a theoretical perspective that courtship processes and parenting responsibilities (rather than male dominance) underpin the production and reproduction of gender identities.
- Main article: Human sexual behaviour
Human sexual behavior encompasses the search for a partner or partners, interactions between individuals, physical, emotional intimacy, and sexual contact. Some cultures discriminate against sexual contact outside of marriage; however, extramarital sexual activity is pervasive. Unprotected sex may result unwanted pregnancy or sexually transmitted diseases. In some areas, sexual abuse of individuals is prohibited by law and considered against the norms of society.
Sexual activity and lifestyles
- Main article: Heterosexuality
Heterosexuality involves individuals of opposite sexes.
Different-sex sexual practices are limited by laws in many places. In some countries, mostly those where religion has a strong influence on social policy, marriage laws serve the purpose of encouraging people to only have sex within marriage. Sodomy laws were seen as discouraging same-sex sexual practices, but may affect opposite-sex sexual practices. Laws also ban adults from committing sexual abuse, committing sexual acts with anyone under an age of consent, performing sexual activities in public, and engaging in sexual activities for money (prostitution). Though these laws cover both same-sex and opposite-sex sexual activities, they may differ with regards to punishment, and may be more frequently (or exclusively) enforced on those who engage in same-sex sexual activities.
Courtship, or dating, is the process through which some people choose potential sexual partners. Among heterosexual adolescents in the mid-20th century in America, dating was something one could do with multiple people before choosing to enter a committed relationship.
Different religious and political movements have tried to influence or control changes in sexual practices including courting and marriage, though in most countries changes occur at a slow rate.
- Main article: Homosexuality
Same-sex sexuality involves individuals of the same sex. It is possible for a person whose sexual identity is mainly heterosexual to engage in sexual acts with people of the same sex. For example, mutual masturbation in the context of what may be considered normal teen development. Gay, lesbian, and bisexual people who pretend to be heterosexual are often referred to as being closeted, hiding their sexuality in "the closet". "Closet case" is a derogatory term used to refer to people who hide their sexuality, and "coming out" or "outing" refer to making that orientation (semi-) public voluntarily, or by others against their wishes, respectively. Among some communities (called "men on the DL" or "down-low"), same-sex sexual behavior is sometimes viewed as solely for physical pleasure. Men on the "down-low" may engage in sex acts with other men while continuing sexual and romantic relationships with women.
The definition of homosexuality is a preference to members of one's own sex, though people who engage exclusively in same-sex sexual practices may not identify themselves as bisexual, gay or lesbian. In sex-segregated environments, individuals may seek relationships with others of their own gender (known as situational homosexuality). In other cases, some people may experiment or explore their sexuality with same (and/or different) sex sexual activity before defining their sexual identity. Despite stereotypes and common misconceptions, there are no forms of sexual activity exclusive to same-sex sexual behavior that can not also be found in opposite-sex sexual behavior, save those involving contact of the same sex genitalia such as tribadism and frot.
- Main article: Autoeroticism
Though many autoerotic practices are relatively physically safe, some can be dangerous. These include autoerotic asphyxiation and self-bondage. The potential for injury or even death that exists while engaging in the partnered versions of these fetishes (choking and bondage, respectively) becomes drastically increased due to the isolation and lack of assistance in the event of a problem.
Coercive and abusive sexuality
- Main article: Sexual abuse
Sexual activity can also encompass sexual abuse - that is, coercive or abusive use of sexuality. Examples include: rape, lust murder, child sexual abuse, and zoosadism (animal abuse which may be sexual in nature), as well as (in many countries) certain non-consensual paraphilias such as frotteurism, telephone scatophilia (indecent phonecalls), and non-consensual exhibitionism and voyeurism (known as "indecent exposure" and "peeping tom" respectively).
Sexual pleasure is pleasure derived from any kind of sexual activity. Though orgasm is generally known, sexual pleasure includes erotic pleasure during foreplay, and pleasure due to fetish or BDSM.
Study of sexuality
Michel Foucault wrote in The History of Sexuality, the concept of what activities and sensations are "sexual" is historically (as well as regionally and culturally) determined, and it is therefore part of a changing "discourse". The sexual meanings (meanings of the erotic dimension of human sexual experience), are social and cultural constructs, they are made subjective only after cultural and social mediation. Being the main force conditioning human relationship, sex is essentially political. In any social context, the construction of a "sexual universe" is fundamentally linked to the structures of power. The construction of sexual meanings, is an instrument by which social institutions (religion, marketing, the educational system, psychiatry, etc.) control and shape human relationships.
According to Foucault, sexuality began to be regarded as a concept part of human nature since the 19th century; so sexuality began to be used as a mean to define normality and its boundaries, and to conceive everything outside those boundaries in the realm of psychopathology. In the 20th century, with the theories of Sigmund Freud and of sexology, the "not-normal" was seen more as a "discontent of civilization"  In a well known passage of his work, Foucault noted that the development of the notion of sexuality organized sex as a "fictitious unity" of "disparate parts, functions, behaviours, and feelings with no natural or necessary relation among them"; therefore the conception of what is "natural" is a social construct. To escape this cultural "sexuality" Foucault suggest to focus on "bodies and pleasures".
- Psychosexual development
- Sexual fantasy
- Sexual satisfaction
- Sexuality in older age
- List of human sexuality topics
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- (Rathus et al. McKenzie, pp. 22)
- Joane Nagel (August 2000). ETHNICITY AND SEXUALITY. Annual Review of Sociology 26: 107–133.
- Joane Nagel (2001). Racial, Ethnic, and National Boundaries: Sexual Intersections and Symbolic Interactions. Symbolic Interaction 24 (2): 123–139.
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- Buss, D.M. (2002) Human mating strategies. Samdunfsokonemen, 4: 48-58.
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- Sex and Relationships - Sex - 4Health from Channel 4
- Improve your orgasm: you may have thought your sexual pleasure was the one thing that couldn't get any better. Think again - Sexual Fitness - physiology | Men's Fitness | Find Articles at BNET.com
- Foucault, M. (1976) The History of Sexuality, Vol I: The Will to Knowledge
- Weeks, Jeffrey. Sexuality and its Discontents; Meanings, Myths, and Modern Sexualities, New York: Routledge. pp.176-8
- MARY WEISMANTEL Moche Sex Pots: Reproduction and Temporality in Ancient South America American Anthropologist September 2004, Vol. 106, No. 3, pp. 495-505
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- Cáceres The production of knowledge on sexuality in the AIDS era.in Aggleton, Peter; Parker, Richard Bordeaux; Barbosa, Regina Maria (2000). Framing the sexual subject: the politics of gender, sexuality, and power, Berkeley: University of California Press. pp.242-3
- Strozier, Robert M. (2002) Foucault, Subjectivity, and Identity: : Historical Constructions of Subject and Self pp.101-2, 108, 118-120
- Foucault 1976, p.154-5
- Foucault 1976, p.157
- Rathus, Spencer A.; Nevid, Jeffrey S.; Fichner-Rathus, Lois; Herold, Edward S.; McKenzie, Sue Wicks (2005), Human sexuality in a world of diversity (second ed.), New Jersey, USA: Pearson Education, pp. 206, ISBN 1-205-46013-5
- International Encyclopedia of Sexuality full text
- National Sexuality Resource Center
- American Sexuality Magazine
- Janssen, D. F., Growing Up Sexually. Volume I. World Reference Atlas [full text]
- History of Surveys of Sexual Behavior from Encyclopedia of Behavioral Statistics
- The South and Southeast Asia Resource Centre on Sexuality
- The Sexuality and Rights Institute
- POPLINE is a searchable database of the world's reproductive health literature.
- The Continuum Complete International Encyclopedia of Sexuality at the Kinsey Institute
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