sexual selection: see selection.

sexual harassment, in law, verbal or physical behavior of a sexual nature, aimed at a particular person or group of people, especially in the workplace or in academic or other institutional settings, that is actionable, as in tort or under equal-opportunity statutes. Once stereotyped as involving pressures brought by one in authority (e.g., an employer, teacher, or ranking officer) on someone in an inferior position, with the aim of obtaining sexual favors, harassment is now recognized as also involving behavior that creates an environment unfriendly to its targets. Thus, sexually explicit or suggestive behavior by male fellow employees may be designed to make a work situation difficult for a newly hired female; the harassers' motive may be mere hostility to female entry into a male "preserve."

In the United States, courts have since 1977 recognized some such behavior as a form of sex discrimination; not only the superior who seeks sexual access but also the employer who fails to restrain the behavior of other employees may be liable to suit. The 1991 Senate hearings in which Professor Anita Hill testified that Supreme Court nominee Clarence Thomas had made unwelcome advances to her some years earlier when she worked for him, and the "Tailhook" scandal, involving sexual hazing by male officers during a navy gathering in Las Vegas, Nev., in Sept., 1991, brought the issue of sexual harassment to national attention. In 1992 the Supreme Court gave individuals harmed by a school's discrimination (now interpreted as including failure to discipline students who harass other students) the right to sue the school for damages. In a series of 1998 decisions the Supreme Court ruled that employees in the workplace are to be protected from harassment by people of the same sex; that an employee need not suffer a tangible job detriment in order to sue for harassment; and that a company having effective complaint procedures that an employee unreasonably fails to utilize is protected from suit.

Recent debates have centered on, among other things, the apparent wide differences in men's and women's interpretations of sexual talk; on whether schools and colleges can or should impose speech and conduct codes or take other measures to protect students, especially females, from sexual talk or behavior; and on whether pornography is in itself a form of sexual harassment. It is apparent that the interests of protection from sexual harassment and of freedom of speech will continue to clash.

perversion, sexual, in psychology, sexual behavior deemed pathological by its deviation from "normal" sexual desire. The definition of sexual perversion has shifted considerably over time: indeed, it has never been an uncontested category of meaning. For example, homosexual desire has long been stigmatized as sexual perversion among many segments of Western society (and remains so among some), but within the field of psychology, it is no longer considered pathological. Use of the term perversion itself has come under wide criticism in recent years. Today, psychologists generally refer to nontraditional sexual behavior as sexual deviation or, in cases where the specific object of arousal is unusual, as paraphilia. There are a number of recognized disorders of this type. In fetishism, the object of sexual desire is either an inanimate object or a nongenital part of the human anatomy. Voyeurism involves the covert viewing of other individuals who are naked, undressing, or engaged in sexual activity, as the primary means of sexual arousal. Sexual arousal as a result of physical contact with prepubescent children is described as pedophilia. Other forms of sexual deviation include exhibitionism, incest, transvestism, necrophilia, sadism, and masochism. Many of these behaviors, when they involve the participation of nonconsenting adults (or children, consenting or not), are punishable by law. Although rape is not classified as a paraphilia, it is a serious sexual deviance, and perhaps the most highly reviled form of sexual gratification. Most forms of sexual deviance are accompanied by any number of other psychological disorders.

or coitus or copulation

Act in which the male reproductive organ enters the female reproductive tract (see reproductive system). Various sexual activities (foreplay) lead to physiological changes that progress to orgasm (climax) and resolution (see sexual response). If it is completed, semen passes from the male into the female's body. If conditions favour fertilization, a sperm joins with an egg, and pregnancy begins (see fertility; reproduction); contraception can prevent this. Intercourse with an unwilling female is rape. Seealso reproductive behaviour; sexuality, human; sexually transmitted disease.

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Inability to experience arousal or achieve sexual satisfaction under ordinary circumstances, as a result of psychological or physiological problems. The most common sexual dysfunctions have traditionally been referred to as impotence (applied to males) and frigidity (females), but these terms have gradually been replaced by more specific terms. Most sexual dysfunctions can be overcome through use of counseling, psychotherapy, or drug therapy.

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The deliberate abstinence from sexual activity, usually in connection with a religious role or practice. It has existed in some form in most world religions. It may indicate a person's ritual purity (sexual relations being viewed as polluting) or may be adopted to facilitate spiritual advancement (as sexual activity would take place only within the bonds of matrimony, marriage and family were seen as an entangling distraction). In shamanistic religions, shamans are often celibate. In Hinduism, “holy men” (or women) who have left ordinary secular life to seek final liberation are celibate. Buddhism began as a celibate order, though many sects have since given up celibacy. Chinese taoism has monastics and independent celibate adepts. Islam has no institutional celibacy, but individuals may embrace it for personal spiritual advancement. Judaism has prescribed periods of abstinence, but long-term celibacy has not played a large role. The early Christian church tended to regard celibacy as superior to marriage. Since the 12th century it has been the rule for Roman Catholic clergy, though clerical celibacy was never adopted by Protestantism.

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