what manga is this?

I'm looking for a manga I've read before, but can't remember the name of. It's of two guys who are both playboys, but one night they don't find any girls to have sex with so they have sex with each other. curiosity won one of them over. In another chapter, the characters are playing a game where they dismember dresses of toilet paper with water guns. there's also a part where the two guys go to a happening bar and have sex while another dude is watching. If you could help me find this manga I would be very greatful.