Admit One

A single movie-goer enters a cinema, popcorn in hand.  He settles into a seat near the front after trying several others on the way.  When the movie starts, a couple come and sit right by him, despite every other seat in the whole theatre being free.

It's not long before the couple start making out. Noisily.  And then it goes further.  This couple are having sex in the seat next to our guy. He keeps his eyes away from them and makes his own earplug to keep the noise out.  He's not sure what to do... Leave?  Alert the staff?

After the show, he ducks into the bathroom, but he's not alone for long...