Do we have a case to sue for pregnancy fraud?

My boyfriend informed me that he had a one night stand a while back with a woman he met on Craigslist. They had consensual sex, and against her wishes, they used a condom. He left the condom at her apartment and left. She now is claiming to be 24 weeks pregnant with his child. He met up with her recently and she informed him that her an her fiance have been wanting a child, but have not been able to, so after looking into in-vitro, they decided that it would be best to find someone to get her pregnant. She said that they are both well enough off so they don't want child support, and they want to put her fiance's name on the birth certificate, but they do want my boyfriend's genetic test done so they know what diseases run in his family. I believe that she may have inseminated herself after he left. I think it is extremely deceptive and essentially stealing his genetic material. Could he sue them? He recorded their conversation where she told him her and her fiance's plan.