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Sexual activity usually results in sexual arousal and physiological changes in the aroused person, some of which are pronounced while others are more subtle.
Sexual activity may also include conduct and activities which are intended to arouse the sexual interest of another or enhance the sex life of another, such as strategies to find or attract partners (courtship and display behaviour), or personal interactions between individuals (for instance, foreplay or BDSM). Human sexual activity has sociological, cognitive, emotional, behavioural and biological aspects; these include personal bonding, sharing emotions and the physiology of the reproductive system, sex drive, sexual intercourse and sexual behaviour in all its forms.
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.
Although the primary evolutionary purpose of sexual activity is reproduction, research on college students suggested that people have sex for four general reasons: physical attraction, as a means to an end, to increase emotional connection, and to alleviate insecurity.
Most people engage in sexual activity because of pleasure they derive from the arousal of their sexuality, especially if they can achieve orgasm.
Two examples that are criminal offences in most jurisdictions are sexual assault and sexual activity with a person below the local age of consent.
For example, the relationships can be ones of marriage, intimate partners, casual sex partners or anonymous.If there are more than two participants in the sex act, it may be referred to as group sex.Autoerotic sexual activity can involve use of dildos, vibrators, anal beads, and other sex toys, though these devices can also be used with a partner.It is related to the idea that opposition between two people can heighten sexual tension, attraction and interest.It has been shown that sexual activity plays a large part in the interaction of social species.