There is a strong "de-people" movement on the left that thinks humans need to be eliminated to save Earth. I suspect the gay marriage thing could be tied in with this movement. I hope I get old and die before gay marriage is mandatory!
Bob Hope, touring the world in the year or so after the passage of the 1975 Consenting Adult Sex Bill:
“I’ve just flown in from California, where they’ve made homosexuality legal. I thought I’d get out before they make it compulsory.”