"I think most of them are born that way, and parents shold be warned."
There is absolutely no real evidence that sexual orientation is genetic. The "gay gene" has never been found, because it probably does not exist.
bttt
This is an outdated and misleading claim/discussion point, at best. There's not necessarily a single "gay gene," but there is some evidence that SOME of the tendencies might be hereditary in genetic material (see lizma's comment for one possibility. However, the true nature of genetic influence on an individual is proving to be much more complex than a simple "single gene"...
Besides, "being born that way" is more than just a claim of genetics. Maybe it's something like a problem with fetal development, etc. I'm also fascinated by the implications of the Emory research on PTSD on this question.
Besides, I think we should use the term "homophilic" for tendencies and preferences, and reserve "homosexual" for acting upon that. Some do not act upon those urges.
All this being said, of course the parents should be notified!
The "gay gene" has never been found, because it probably does not exist.
Yeah. And if it could exist, how does one pass it to the next generations? I mean, I'm a few years out of Biology 101, but how do gay people produce children?