He wants no distractions
They say that the reason that a guy as ugly as Ron Jeremy got into porn was that he - at the time - was one of the few guys that could keep an erection in public. Fascinating, I remember most teen guys getting erections at some point when asked to go to the blackboard in school.
I remember 40 years ago and there was a couple having sex in an upper apartment one hot summer night with all the windows open. When they were finished the whole building erupted in applause.