"Yeah well... you wouldn't have your porn either!" Okay, so maybe a cave wasn't the best idea. Unless it was a cave with WiFi and electricity and water... Wouldn't be much of a cave then, though.
Sam disappeared into the bathroom and the shower could be heard a few minutes later. He washed quickly, not wanting to use all the hot water just in case Dean got off his lazy ass and decided he wanted to shower too. He towelled off changed into his boxers and t-shirt and brushed his teeth.
Re-entering the bedroom, he threw one of the damp towels at Dean. "Bathroom's free."