EW, YUCK, GROSS!!!
marriage! and then the offspring!! urg, who would choose such a life?!
yay for gay marriage, can't see a problem with all the legal rights, but no marriage in my extended family, kinship group, whatever, has succeeded, and never will.
as for children, again why would you want one? they just make smells and noises, and then people see fit to take them into public... but i know kids of gay couple who are very well adjusted, but have heard horror stories of other parents not allowing their kids to play with the little boy of a lesbian couple, which is rediculously outdated.
Josh
EDIT: also, just read the genetics bit, but historically, it hasn't always been turned away by cultures, before Christianity it was common for even married men to see either sex prostitutes.