As for your upbringing having an effect on your sexuality, I can see it logically having an effect on your apparent sexuality. If someone is told over and over again by their guardians and the society they live in that the only acceptable way to be is straight or gay, then they're much more likely to at least try to ascribe to that sexuality.
I don't think, however, that will be a problem with gay parents raising children as American society is inundated with images of heterosexual couples. No parent, no matter how closely they watch the behavior of their kids, will be able to take away all "straight couple" influences on a child in this country.
I don't think, however, that will be a problem with gay parents raising children as American society is inundated with images of heterosexual couples. No parent, no matter how closely they watch the behavior of their kids, will be able to take away all "straight couple" influences on a child in this country.