Situational sexual behavior

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.

[1]: 48  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.

[2] Some people change their sexual behavior depending on the situation or at different points in their life.

These men often describe how they imagine being with a woman while taking part in sexual activity with a male inmate.

[7] Recent Western surveys have found that about 87% of women and 93% of men identify themselves as "completely heterosexual".