neutrois:

In the state of California third parent adoption has recently been made legal, the result of decades of fights by queer couples whose sperm and egg donors wanted to contribute more than genetics. We are, as far as we know, the first set of parents to take advantage of this law which includes a straight couple, and definitely the first to include an asexual, but we know that what we are doing is not without legacy. 

David Jay, founder of AVEN (asexuality.org) tells of his journey to become a third parent.