0.5x A Presses / But First We Need to Talk About Parallel Universes - Parallel Universes: Gachimuchi Locker room edition

Yup. They're typically labelled "gachimuchi remixes" in English and they actually use a ton of different gay porn clips, but this is from a more common one. They've gained some attention on the English speaking web as well, actor Van Darkholme ("Henry" in this instance) and some of his lines are particularly popular.

I'm a bit surprised there isn't a KYM entry on them yet. Most of them are uploaded to Youtube in addition to Nico Nico (NSFW!):