I personally would love to have a gay child, so your presumption that no one WANTS a gay kid is incorrect. Just as you pointed out, most people don't care whether their child is male or female, as long as it's healthly - why wouldn't they also think "I don't care whether it's straight or gay, as long as it's healty"?

you think that all people who are becoming parents want straight children - children that reflect themselves - but i think that what they want is an easier life for their children, which unfortunately, means being straight.