Its far more choice than biology... its not mere biology that gay men tend in large numbers to fall into 1 of three categories:
1) Horrible or no relationship with a father growing up.
or
2) Overbearing mothers
or
3) Molested by men as children.
None of those factors has anything to do with biology, yet they are all very very common themes among homosexual males.
My whole point is that this has not been proved but regardless of reason everyone is responsible for their actions. The left loves to play the "Cause" game. Don't fall for it. Our objections should be restricted to actions. Responsible people don't give in to every desire generated by our brains.