You've got proof of the gay gene?
Give it time....they'll find it.
"Circumstantial" evidence...is that the proper word? For example...fraternal twins could perhaps explain this phenom. Both raised by same parents in same fashion...one is homosexual and one is heterosexual.
A lot of lesbians look very butch...and walk masculine, gesture masculine...it's not an act. It's ......< drumroll >
GENETIC!!!