This book felt like smut for the sake of smut. I enjoyed the smut, but it was almost like reading the screenplay of a porno. 
I think the only descriptions I remember of the characters physical appearance was that Jake had brown hair and green eyes, Mars had long blonde hair and was Finnish and Caleb had a pierced d*ck.

I think I would have been able to give this a higher rating if it wasn't as long as it was. It almost feel like an errand to get through.