Basically it's a world were men can have children. I suggest you google and find these yaoi mangas like their pokemon because they are so worth reading. In the omegavese world soul mates exist and you can be bond to a partner for life. It is genius.
There is a new shounen ai anime out called Kono Danshi, Ningyo Hiroimashita. It's really sweet and I suggest you give it a try. Here is the summary I got from MAL. And the link to watch the show. Let me know what you think :D