Worse yet for the lefty hetero females, when they find a non-gay lefty, more than likely, the guy is a metrosexual.
So basically it will break into a two dating system. One party for mere sex, the other for relationship.
Reminds me of a group of party girls who though they could party outside the Greek church community and then become born again virgins inside the church community when they wanted to marry.
Funny this should come up: a friend of mine is the recent beneficiary of the fact that all the males in his fiancees group of friends belong to various theater groups and, by her admission, are "all gay."