I find it silly that you would reject a character because they are infertile. In roleplay, most see being a mate as an equivalent to marriage. People still marry if the other is infertile, so it's rather stupid that infertile characters wouldn't get a mate. Personally, I see infertility actually not being used correctly in the roleplay community. All the ligers and other big cat hybrids in real life are infertile, but, to my knowledge, these characters are all roaming around having cubs.
But, with my last point, I guess I'm just a bit hyper-realistic. -shrug-