Our happy hour fact to amaze your drinking buddies with.

Portia di Rossi Ellen DegeneresMany women who "begin" to feel lesbian attractions may have started out as genuinely heterosexual.

It is generally thought that women who "become" lesbians in their 30s (or beyond) were simply suppressing their sapphic urges early in their sexual lives. Two recent studies call that theory into question. Both are based on interviews with women who shifted their sexual orientations.

In the first, Christan Moran, a researcher at Southern Connecticut State University, talked to 200 lesbians who had previously been in heterosexual marriages. She concluded that there is "great potential for heterosexual women to experience a first same-sex attraction well into adulthood."

In another study, this one from the University of Utah, 100 women who had displayed some degree of same-sex attraction were tracked over a decade. Some of the women who classified themselves as "lesbians" became heterosexual, and some who considered themselves "bisexual" became lesbians. This suggests female sexuality is much more fluid than male sexuality.

It also suggests that if a former girlfriend goes lesbian, it might really be because of something you did (or didn't) do.