Ask your mom or a girl.
NO NO NO!Girls dont want to see guys butt crack! its um unflattering :S
Girls butt right? It means they like what they see! :)
It all depends on personal preference, but most girls like a firm but with a bit of shape on a guy.
he could be, or maybe he's trying to see how far he can get with you
They have the prettiest butt.
With your hand
A deri is a butt. -.-