California Family Law

According to California Family Code §7613

"(b) The donor of semen provided to a licensed physician and surgeon or to a licensed sperm bank for use in artificial insemination or in vitro fertilization of a woman other than the donor's wife is treated in law as if he were not the natural father of a child thereby conceived."

Full Text of Family Code:

Calif: http://law.onecle.com/california/family/ (full text)
Calif: http://law.onecle.com/california/family/7613.html (specific to donors)
Calif: http://www.leginfo.ca.gov (and click on California Law, then the check box for family code search)
Other States: http://law.onecle.com/

Links

Assisted Reproductive Technologies and the Law (PDF) - Center for American Progress
http://www.americanprogress.org/issues/2007/12/pdf/arons_art.pdf


Gay and Lesbian Demographics - Urban Institute	"96 percent of all U.S. counties have at least one same-sex couple with children under 18; yet only seven states and the District of Columbia have laws supporting gay and lesbian couple adoption."
Lesbian Mom Demands Child Support from Sperm Donor Dad - fathersandfamilies.org	"A court battle over whether a sperm donor should pay a higher rate of child support has ended with a ruling that the man is liable because he has taken an active role in raising the children."

The advice of an attorney or understanding of law is recommended.