There's a new website pushing for same-sex procreation out there, appropriately called www.SameSexProcreation.com. There are lots and lots of links there, including a really good section on epigenetics and the research going on to determine all the sex-determined imprinted genes.
The author believes that SSP should be developed mainly to force SSM to be accepted, on the theory that everyone will drop their objections to SSM once procreation is possible. It is a reasonable theory, since many people argue that SSM should not be allowed since procreation is not possible, but the more likely conclusion is that SSP will be oppposed for all the other reasons they oppose SSM. We reach the same conclusion that if SSP is allowed, then SSM should be allowed also, but we differ on whether SSP should be allowed.