One example of situation-specific sexual behavior would be a person who self-identifies as heterosexual, but will sexually interact with a member of the same sex when lacking other opportunities, such as
among soldiers,
among prison inmates,
among college students, or in similar
single-sex communities and institutions. Likewise, a person who self-identifies as gay or lesbian (either at the time, or later) may sexually interact with a member of the opposite sex if a same-sex relationship seems unfeasible. For example, some men and women in a university may engage in bisexual activities, but only in that environment. Experimentation of this sort is more common among adolescents and young adults, both male and female. Some colloquialisms for this trend include "
heteroflexible", "BUG" (Bisexual Until Graduation), or "
LUG" (Lesbian Until Graduation). In prison,
heterosexual-identified
men who have sex with men view their
homosexual acts as being "situation specific" and may not consider themselves
bisexual. These men often describe how they imagine being with a woman while taking part in sexual activity with a male inmate. During
masturbation, they picture past sexual experiences with women. They take part in
homosexual activity due to having no "heterosexual outlets". In some cultures, sexual relationships with women were unobtainable for many men, because women were sequestered and strictly forbidden from engaging in extramarital sex. This may have resulted in higher numbers of men, especially unmarried men, engaging in homosexual behavior. Examples of this include
pederasty in ancient Greece and
bacha bazi in
Afghanistan. Recent Western surveys have found that about 87% of women and 93% of men identify themselves as "completely heterosexual". The
World Health Organization estimates a worldwide prevalence of
men who have sex with men between 3 and 16%. ==See also==