"The fact that homosexual behavior exists in nature amoung other species should indicate something ..."
The fact that something "exists in nature" does not create a social obligation to sanction it. Nor does the fact that homosexuality "exists in nature" imply that it is never a chosen behavior.
And if choice is a significant factor in homosexual behavior, and if homosexuals have a higher rate of alcohol or physical abuse than heterosexuals, then it would make some sense to examine this relationship.
I applaud the board member.
Bingo. Nor does it imply that it's "normal."
Mounting behavior is actually a dominance behavior that animals will do to other animals of the same sex. Has very little to do with sex.