Why is that, I wonder? Is it something as simple as "because a man knows what a man likes and a woman knows what a woman likes?"
I've known straight men who, even after years of trying, still haven't got a clue how to satisfy a woman and vice versa.
But put a man into bed with another man, or a woman into bed with another woman and WHAM! Suddenly everybody knows exactly what needs to be done in order to make everybody else happy!
Look, I'm all for procreation. After all, not everybody is cut out for a life of spare cash, incessant sexual gratification, fine dining and tastefully appointed condos in New York and South Beach. Some people need the overall deshabille and slovenliness, not to mention excess tonnage brought on by years of junk-food-stuffing-in-lieu-of-sexual-satisfaction, which can only be achieved by a life dedicated to boring old man on woman lovemaking.
And it's not "all about politics" either. And, to prove my point, if you're a gay man which would you prefer:
And, if you're a gay woman, this:
I rest my case.