There's a line in every person's humanity you don't cross. To me, that's renting your uterus to people. You start by letting people ask friends to do it and then you end with huge businesses to guarantee a "perfect baby" to any couple. Having this option can only lead to the harshest discriminations to people with the smallest genetic imperfections and, to me, it's not right. Note that I would be against this even if straight couples were doing it.Why though? If a woman wants to carry a child for a same-sex couple, why would that be an issue? It's not like they are forced into it.
Sure, having this line of thought can lead to healthier generations of people, but what's stopping them from deciding to not have a baby with a person with a genetic predisposition to Huntington and one that's just bald? To me, letting people rent their uterus is the beginning of something catastrophic and I don't like it.
You're free to sell your body the way you want to, but please leave another living human being alone.