I'm looking for a specific series that I've forgotten the name of since it's been a million years since I've read it. It's a mature title featuring a boyish female lead who has large breasts, much to the dismay of the male lead who is obsessed more or less with feminine beauty and hates her tomboyish nature as a result. The male lead is very straight (so it's not a yaoi or shounen ai) and is notorious for having casual sex but crossdresses in secret, and the female lead finds this out and it's a sort of foundation of their friendship. Something I specifically remember is a whole page where he compares his junk to a pipe that connects him to the girls he sleeps with, so he can envision himself being the pretty girls. Not sure if this counts as a gender bender or not. I think they're all in college, too?

Maybe Himegoto - Juukyuusai no Seifuku

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"The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it."
- Albert Einstein

Yeah that's definitely Himegoto