I have to be honest, I mulled this one over for an hour. Here is what I conclude:
It would have to depend on the STD. From my knowlege, certain STDs aren't transferable even after birth. If that were the case yes I would have children. You can give birth to a healthy child no problem- its the breast milk that can contain the STD so that should be avoided. As for other STDs that could effect the child I say no, I wouldnt' have that child. I would adopt.
I wouldn't give birth to a child risking giving it a STD because of the mental reprocussions of worthlessness, the pain of being different, and the reactions from people in general that is so unfortunate that many STD contracted people share.
This idea is different than dating a person with a STD because I as person have the ability to walk away from that relationship or stay knowing what illness they have. A child has no such choice, in a sense I chose for them to live that life. In a sense I have the ability accecpt my partner, but my child will have to find someone to accept them. In the world we live in I can see how that is hard.
As for homosexuals- only they themselves can do what they will. I never would condemn or judge someone harshly because they're a homosexual but I will inform them what they're doing is sin. I believe that God can change any heart- to say that a homosexual isn't capable of changing their ways in my opinion is an excuse. God can do anything He wants and there are reformed homosexuals. I wouldn't say its easy, but a healthy love was only made for a man and a woman. Maybe they can find a really manly woman but that's their choice to make not mine for them.