Alex,
"can we abort ?"
That is an interesting question.
That points out how selective abortion will be used more and more to finetune births.
DNA research is making rapid inroads.
The opinion among many people is gays are "born this way". I'm not making a judgement call. I am sharing my observation.
Personally...I believe environment plays a substantial role in molding people towards developing sexual tastes and appetities.
What do you think grooming is all about?
That being said, if and when DNA markers can be isolated indicating a high degree of accuracy of the likelyhood of someone's child being born gay, can you guess one demographic that will see a drop in percentage of population?
I mean...be honest....how many couples who find themselves pregnant say, "I hope our baby is gay"?