Mumblecore Indie film in the late 90s or early 2000s. Might have been Canadian… not sure.

Caucasian male lead (possibly also the filmmaker/director)

Guy is pressured to do “penis art” at party, reluctant as he’s had a testicular cancer scare (or something else wrong with his testicles – can’t remember)

Girl he knows from online dating site comes to visit, ends up living with him but is noncommittal on her feelings about him and he ends up getting really annoyed that she won’t have sex with him.