Why is the gay lifestyle touted as a "normal" and healthy lifestyle?

I am NOT looking for any gay bashing... I know people that are gay (men and women) and some are friends. I just don't accept the lifestyle as a normal alternative to a heteroual relationship. But more and more gayness(?) is presented as "normal". The reason men and women have hormonal and physical attraction to one another is to perpetuate our species (procreation). If everyone were gay, how would we survive? Where would babies come from? Should we p on to our children the idea that being gay is normal? I accept gayness because I have to but no arguement in the universe can change the fact that it is NOT normal.