Attractive people have a distinct advantage in life. This is especially true in the context of MMA where promotion is half the game. We all know this.
Having said that, Ronda Rousey is slightly above average at best. You could take any women that's in shape and not butt ugly, strip her down to next to nothing, give her a nice tan and have her hair blow in the wind and men everywhere would want to f*** her. The whole thing reminds me of this Daniel Tosh joke: