Homosexuality is the result of a complex combination of biopsychosocial factors. To say otherwise is simply ignorant.

As for testing: why should a test be available? The fact is that it creates a system open to abuse.

Really I'd say it is possibly a better solution to want your society to change, than want your child to change. If we adapt to society it will never change. The great changes in our society have come from people forcing their social structure to adapt to them, rather than the other way around.

To 'mind' your child's sexual orientation is something like 'minding' having a disabled child, a gifted child, or a female instead of male. Homosexuality is the unavoidable consequence of a complex set of biopsychosocial factors, to 'mind' it is somwhat bizzare.

I think it is possibly fair to say that no couple should 'want' their child to be any sexual orientation.

The vast majority of gay couples, thankfully, neither 'want' or 'expect' their children to be gay.