In Abby and Nate's risque love scene the nudity .......

Okay in episode four when Abby and Nate had the very raunchy kind of X rated love scene , Abby got down to just her bra and underwear , but Nate took off his pants and his shirt was partially unbuttoned , and he took off his underwear , but when he got on top of Abby , I think his bare butt showed and then when he got on the bed , but I wasn't sure , that was his bare butt right like bobbing up and down , like jackrabbit style , that his butt right ? I know he showed it in the morning after scene when he went to the bathroom .