Random - I don't think that my child's sexual orientation would change my love for them, and more than my friend's orientation has anything to do with how well I get along with them.
If I HAD to choose one or the other (as if sexuality wasn't on a wide grey-scale), I'd have to pick Heterosexual. Frankly, Homosexuality has not reached a point where it is as socially acceptable as I'd like. When I think about the rampant homophobia out there, and the social pressure to conform to a "norm", I shudder to think of what goes through a gay/lesbien person's psyche every day. I'd rather not subject any child of mine to any more pain than necessary.
Humans are nice, but people are wild, violent animals with no lookout but for themselves.