Omegaverse is in which males can get pregnant. It isn't always the most popular AU, but it is still used by others. In this system, there are three main roles: Alpha, Beta, and Omega.
im not that good at explaining so here's my omegaverse list:
http://www.mangago.me/home/mangalist/172687/
Ooooh! Thanks for the explanation! (๑•ㅂ•)و✧
this picture from an omegaverse mangaka should explain it.
http://www.mangago.me/read-manga/abarenbo_honey/nbt/6d5913acc7b0dbb2/ChChapter_1/6/
┑(￣Д ￣)┍ I keep hearing, of this thing called OmegaVerse.. so what is it?