Interestingly, I'm seeing that the State is or has been interested in the income derived from the whole Mary Kay Letourneau-Fualaau (good grief - try saying that after a few beers!) debacle. She was convicted (and that worked so well...not), but while she was never ordered to pay child support for her children with Vili, they did actually receive some sort of state aid and the government appears to want that money back.
I can see how states would have an interest in finding the fathers of children whose mothers are receiving welfare payments, to seek reimbursement for the money spent by the states on the children. I am sure that is why a handful of males in a few states who were minors at the time of their
statutory rapes have been ordered to pay child support. This seems to be (from my very brief review) only if it can be determined that the sex between the minor boy and the older female was consensual.
Although I have not read in depth any of the cases I ran across, there is
San Luis Obispo County v Nathaniel J.. This is a 1996 California case that involved the statutory rape of a 15-year-old boy (Nathaniel) by a 34-year-old woman (Ricci Jones), who gave birth to Nathaniel's child in 1995. Although Jones was convicted on the rape charge, Nathaniel had said the sex was consensual. Because he was a "willing partner," he was ordered to pay child support.
Bucher/Fuller was the most recent male-rape case I located where the male claimed that the sex was
not consensual but, admittedly, I didn't search very hard. And I thought Bucher was appealing his case, but I could be wrong.