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Sexual activity can be classified into the gender and sexual orientation of the participants, as well as by the relationship of the participants.For example, the relationships can be ones of marriage, intimate partners, casual sex partners or anonymous.Joan Roughgarden, in her book Diversity, Gender, and Sexuality in Nature and People, postulates that this applies equally to humans as it does to other social species.

Some sexual activities are illegal either universally or in some countries or subnational jurisdictions, while some are considered contrary to the norms of certain societies or cultures.Two examples that are criminal offences in most jurisdictions are sexual assault and sexual activity with a person below the local age of consent.Sexual activity can be classified in a number of ways: acts which involve one person (also called autoeroticism) such as masturbation, or two or more people such as vaginal sex, anal sex, oral sex or mutual masturbation.It releases tension, elevates mood, and may create a profound sense of relaxation, especially in the postcoital period.From a biochemical perspective, sex causes the release of endorphins and increases levels of white blood cells that actually boost the immune system.

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