Alex Dimitriades and Julian Garner in Head On (1998)
6 minutes in the movie, Alex Dimitriades is masturbating in bed. A very hot and sensual scene. At the end of that scene, we see Alex Dimitriades touching his very thick uncut and hard cock.
84 minutes in the movie, Alex Dimitriades is forced to strip by the police. We see his butt but he is covering his genitals.
90 minutes in the movie, Alex Dimitriades and Julian Garner are both naked. They start fooling around but then start fighting naked. We see both butts at length as they fight. We also briefly see Julian Garner's small uncut penis.