This is an interesting situation. I did some research and could find nothing remotely on point.
I image that paternity could be proven and child support would be instituted. Support can even be required of a rapist in California ...
Here's a snippet from a California case that dicusses the issue of child support being paid by a rapist.
"At oral argument, the Attorney General pointed to a 1997 Report of the Assembly Committee on Public Safety, which in discussing a proposal to require registration for persons convicted of unlawful sexual intercourse, queried: “How many [teenage] mothers would want the father of their child to plead guilty to statutory rape and be subject to a [lifetime] registration requirement?†(Assem. Com. on Public Safety, Rep. on Assem. Bill No. 1303 (1997-1998 Reg. Sess.) Apr. 22, 1997, p. 4.) The Attorney General asserts that the possibility of pregnancy distinguishes voluntary sexual intercourse from voluntary oral copulation, because requiring the father to register as a sex criminal might stigmatize both the mother and the child, and might harm the father’s ability to support his child."
It uses the word "harm" not prevent so therefore support would be required of a rapist if for some religious belief the mother did not want to terminate the pregnancy.
As for the release, its probably a good to add a clause noting that the performer waives any right to bring a claim for the unintended pregnancy.
It might also be a work comp situation since it did occur during the performance of a work related duty.
Either way, it is most likely that multiple parties would pay for the doctor's bills (the studio/insurance comp), the child support (the father) and possibly lost wages (the studio/ insurance comp).
Michael
AdultBizLaw.com