That's right all manga seems like that,if it were my school , i won't go to that kind of place since i was a scaredy cat but if i caught these kind of incidence it would be very interesting ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
There's one that I'd have to find for you but there are always two guys that interupt the couple when they're about to have sex and it's hilarious! (≧∀≦)
Here ya go! Warning: it's a threesome so if you don't like stuff like that than I don't suggest you read it.
http://www.mangago.zone/read-manga/bokura_no_mitsudomoe_sensou/
What a great school they have. They are having sex in school and nobody disturbs or sees them, as if all the others vanished.