Sexual dysfunction is the inability to react emotionally or physically to sexual stimulation in a way projected of the average healthy person; it can affect different stages in the sexual response cycles, which are desire, excitement and orgasm.
It releases tension, elevates mood, and may create a profound sense of relaxation, especially in the postcoital period.
Some people engage in hate sex, which occurs between two people who strongly dislike or annoy each other.
Sexual activity can be consensual, which means that both or all participants agree to take part and are of the age that they can consent, or it may take place under force or duress, which is often called sexual assault or rape.
In different cultures and countries, various sexual activities may be lawful or illegal in regards to the age, gender, marital status or other factors of the participants, or otherwise contrary to social norms or generally accepted sexual morals.
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.
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.
Sexual activity can be regarded as conventional or as alternative, involving, for example, fetishism, paraphilia, or BDSM activities.Some non-conventional autoerotic practices can be dangerous.These include erotic 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 in the autoerotic case due to the isolation and lack of assistance in the event of a problem.People engage in sexual activity for any of a multitude of possible reasons.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.Sexual activity normally results in sexual arousal and physiological changes in the aroused person, some of which are pronounced while others are more subtle.