[-=Zyth=-]

As usual a lot of people you have missed the whole love thing.
2 women meet, get on great, after a while this becomes affection, then things happen etc. Same situation with men I guess, although men are more driven by their sexual desires than women aparently, 'You men all think with your balls' etc, so its simply desire.

Genetic, yes its partly that.
Psychological, yes its partly that.
Social pressures, yes its partly that, although not very much.
Fashion, yes its partly that.

To answer the question, as will inevitable happen, we will get to chose some general genetics for our children at the zygote stage and no I would not chose for my child to be gay. The only people who would do this imo would be gay couples, and I would have to question their reasoning for this.

If changing your childs sexual preference, is going to make them psychologically traumatised then why would you do it? It would be like beating the gayness out of them, not a very nice thing to do.