Takun
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Well, as far as genes go, consider that it might lay dormant in people. I have a gay uncle - he's been with his partner for longer than I've been alive (over 20 years, but other than that, I don't know exactly) and definitely doesn't have kids. But what if my mom carried something in her genetics? Gays have parents, and sometimes siblings.
Of course, there is that a lot of times gays do get married and have kids before realizing themselves. I went to a gay church when I was 16-18 and one of the lesbians there had a son from a previous marriage. He came to church, and though he was a little younger than me, we because pretty good friends. He was *totally* straight.
Another thing is that as well as adopting, many gays are choosing to have children somehow - lesbians, mostly, who go to a spermbank, or find someone they're willing to father a child - many times a gay male they know, who would be willing to father a child for a lesbian couple. Gay men can, I suppose, find a surrogate mother as well - but I'm not really sure about how that would work. o.o
Now, I think it's partially nurture...but I go very much with nature, for the most part. My uncle might be gay, but he didn't raise me - my straight mom did. I have a straight brother. I have straight cousins, from straight parents. I wasn't 'nutured' any differently from them...yet here I am. A straight person can have a gay child, a gay person can have a straight child - but I think there is something that a gay person is born with that at the very least makes them more likely to be homosexual.
Consider this - my mom is blonde, my uncle is blonde, and ONE of my aunts is blonde. The other is a brunette. Now, my blonde aunt had two daughters - one a blonde and one a brunette. My brunette aunt also had two daughters, but they were both blonde. My dad has black hair, and my brother and I are both blonde. So, applying that to 'gay gene' - you can be straight, and still carry 'the gay' to pass along to your children, just like you can have brunette hair, but still carry a gene for blonde hair. Vice versa, of course, that gay people are very likely to have straight children.
That's what I meant, but you are much better at explaining it. Thank you.