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 heterosexual teen development. Gay and lesbian 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. Making that orientation public can be called "coming out of the closet" in the case of voluntary disclosure or "outing" in the case of disclosure by others against the subject's wishes (or without their knowledge). Among some communities (called "men on the DL" or "down-low"), same-sex sexual behavior is sometimes viewed as solely for physical pleasure. Men who have sex with men, as well as women who have sex with women, or men on the "down-low" may engage in sex acts with members of the same sex while continuing sexual and romantic relationships with the opposite sex.
"Human sexuality and gender relations are closely interrelated and together affect the ability of men and women to achieve and maintain sexual health and manage their reproductive lives. Equal relationships between men and women in matters of sexual relations and reproduction, including full respect for the physical integrity of the human body, require mutual respect and willingness to accept responsibility for the consequences of sexual behaviour. Responsible sexual behaviour, sensitivity and equity in gender relations, particularly when instilled during the formative years, enhance and promote respectful and harmonious partnerships between men and women." 

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. 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.
Facesitting is a form of oral sex in which the receiver sits on the giver's face and pushes into it with his or her genitals. Oral sex can also be performed by both partners at the same time in the so-called "sixty-nine" position. Spitting and/or swallowing of the ejaculatory fluids or giving a pearl necklace may cause different sexual stimulations. Autofellatio is a possible but rare variant; autocunnilingus may also be possible for women with extremely flexible spines.
Dr. Jack Summers, director of research for San Francisco's Institute for Advanced Study of Human Sexuality, says, "It's just like sucking a Popsicle. It shouldn't be any more ergonomically challenging." In turn, Ted McIlvenna, president of the Institute for Advanced Study of Human Sexuality, has accumulated reams of data on this very subject. Upon learning of 13 cases of whiplash, he determined that "when you lean over too much, the jaw can be inconvenienced." He suggests that anything that will make a man orgasm faster will help reduce the number of this kind of repetitive-motion injury. He says the "number-one culprit" of men not orgasming faster is drinking too much. So, don't. 

Oral Sex

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