Harem effect
Encyclopedia
The harem effect is an example of situational sexual behaviour in which women confined in a harem
Harem
Harem refers to the sphere of women in what is usually a polygynous household and their enclosed quarters which are forbidden to men...

 practice lesbian
Lesbian
Lesbian is a term most widely used in the English language to describe sexual and romantic desire between females. The word may be used as a noun, to refer to women who identify themselves or who are characterized by others as having the primary attribute of female homosexuality, or as an...

ism due to lack of male contact. This is similar to prison sexuality
Prison sexuality
Prison sexuality deals with sexual relationships between confined individuals or those between a prisoner and a prison employee . Since prisons are separated by gender, most sexual activity is conducted with a same-sex partner, often in contradiction to a person's normal social sexual orientation...

 in that those involved would, presumably, be exclusively heterosexual given the option.
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