jack, in response to your question about parents' concerns - or not - about the sexuality of their children - which i think links in with my earlier point -
During pregnancy, any parent wants a healthy happy fully-formed baby, but when puberty arrives for your child, you want them to be safe, secure, and happy what ever sexuality gives them.
My only concern with my daughters was their happiness and fulfilment, and I would do my utmost to help them to achieve that - and if they were gay, I would redouble my efforts, given, as i said, the hostile world in which they would be living, they would need the unconditional love and support of their family all the more.
I entirely agree with your sentiment - sexuality should not matter at all, in an ideal world, but this is not an ideal world, and to the majority, it does matter.
I can see massively raised levels of acceptence in my childrens' generati0n compauired with mine, and certainly with my parents - long may that continue.