Are you serious? You're seriously saying these things. BEING GAY IS NOT A BELIEF! You can choose your beliefs. I can choose to believe in God. I can choose not to. I can not choose to be straight.And having sex with a woman doesn't make me bisexual. It means I had sex with a woman, NOTHING more. I didn't say I had to like it. Let me tell you... if you were raped by a man, and you couldn't stop him... does that make you bisexual? Does that mean at that point, you will start sleeping with men as well as women?
I had a student last year who had two lesbian mothers. One of the mothers was the biological mother--the child conceived by a donation from a heterosexual friend. This child was loved so much by her mothers. This child was struggling like crazy in Italian--when I started my leave replacement, the first thing I had to do was calculate averages, and his was a 54. I spoke with his parents and we sat down to see what we could do to bring up his average. Now, from what I understand, he had no luck in foreign languages in the 2.5 years he was in middle school. By time the next marking period came around, his average shot up to an 84. What happened? His parents (both mothers), sat down with him every single night and helped him review and study. His parents encouraged him to participate more in class. I gave him extra help once/week. The mothers used every ounce of free time they had to help him.
He loves his mothers. He loves his biological father. They mothers took him on vacations, let him have sleep overs, etc., do everything he wanted (within reason of course). The kid felt very loved, and was in a safe, secure, caring environment.
Sounds like a damn good family to me.
As for the child only containing genetic material of one partner, of course... you can't have both. But what is wrong with having a piece of yourself in your child as long as your partner is okay with that? The child is truly a child of one partner. And provided your partner cares about the child, loves them, and treats them well, I see no reason for that to not be considered a beautiful family.