From infinityshark:
christians show up at chicago pride — to apologize

The guy being hugged:
I Hugged a Man in His Underwear. And I am Proud.

The guy hugging:
Tristan's Response: A Man in His Underwear Hugged Christians

I only saw 2 guys in assless pants and no nudity. As Jenny said, you could see 2 guys in assless pants on any given day in SF, no special event necessary. :P