Study Buddies(2007)

Under the ruse that they are studying, these horny college guys find all kinds of excuses to hook up for a refresher course in anatomy using each other as demonstration models. As you will see, they are quite experienced with the liberal arts of cock sucking and licking each other. Mom and Dad won't be surprised to know that their lazy college son is still sitting on his ass; though now he's sitting on someone else also.