If you pick up a genetics textbook anywhere you can study about selection against a recessive or dominant trait. If it were dominant there would be no homosexuality; if it were recessive it would be as common as albinism, or 1 in 5,000 instead of 1 in 20.
I'm sorry but you really are in correct there I have to say. In the case of one recessive gene the odds on expression are 3:1 (dominant : recessive), the odds for characteristics requiring two recessive genes are 15:1 (9:3:3:1 (DD, DR, RD, RR)) . for charecteristics requiring the expression of more than two recessive genes the odds go up in an exponetial manner