William H. Macy & Ethan Cutkosky on Shameless (2021)

Episode 6 of the final season of the Showtime drama Shameless featured rear nudity from leading man William H. Macy, as his character Frank took part in some raunchy sex early in the episode. He was shirtless and showed off his butt multiple times for Frank's hookup. William's co-star Ethan Cutkosky was also shirtless later in the episode as his character Carl got involved with his own sexual exploits, though Carl's efforts to use a condom were ignored by his new friend Tish. 

William H. Macy

Ethan Cutkosky