Many folks have suggested we use a known donor. And we've had several offers from male friends. But it's tricky.
We love the idea of a known donor, to a certain degree. We like the idea of knowing what he'd look like, his history, his personality, etc. But we don't want anyone having access to our child. It's hard enough for us as two parents to make decisions without getting someone else involved. And, in the state of Georgia, anyone who has any blood link (ie, a sibling of the donor) to our child could take us to court and win custody, even though R will be the biological mother who gives birth. Even if that donor relinquishes parental rights.
But using an anonymous donor is tricky, too. We want to know more than what we read on a piece of paper. We worry that our child will be resentful to not have access to the identity information (until they're 18, that is). And then, of course, there's the whole issue of all of the half-siblings roaming about. Do we try to connect with them or not?
As far as having a strong male role model present, we're not worried about that. He/she will have two uncles that will be actively involved, as well as grandparents, and the many friends of ours who are male and just as excited about our baby as we are.
At any rate, I think we're planning to use an anonymous donor because we just can't risk losing our child to someone else. But we're weighing our options and will continue to do so.