Tolerate and get pissed if he/she ever brings their bf/gf around. But still tolerate it. He/she is my son/daughter and we're all human. If they'd made it to the age of eighteen, they'd already know my views on the subject and thus there wouldn't be any point to me voicing my opposition unless this son/daughter directly came to me and my hypothetical wife talking about getting married or whatever. In the final analysis, God is the final judge and that's that.
It's clearly coming from someone without children.
As someone with gay friends who had religious/conservative parents... it's a radically different concept to deal with once it's your child, your flesh and blood.
