I don't exactly know why but male pregnancy seems to be the bane of Gay Romance. I have even found a place where an editor pleaded her authors to not send submission of stories with male pregnancy since she was really tired of them... and I thought, how strange, in my experience I have not found so much of them. Well, this is probably due to the fact that I'm not a big fan of fantasy or sci-fiction, and so, obviously, I skim from the beginning the possibility to find them. But when it happened, actually they didn't bothered me, on the contrary, there are some series (like Space Opera by Stephanie Burke, when will she write the third book?) that I really like a lot. True, it's not easy to write them without falling in the mistake of having one of the male involved being merely a girl with male attributes, but well, that is the only way for a man to get pregnant!