Why do GUYS touching each other's crotch? Is it for fun? or... I'm curious?

Ok so i have fellow guy friends in class and I don't know it seems weird to me that they have to touch each other's crotch and start laughing or cover themselves with a backpack or hands and I always stare at them in disbelief like what the F is wrong with them? It's not like I'm a creeper or sth they do that in class I mean.. they're publicly unashamed is it how guys are I mean ik that saying "boys will be boys" but damn it I'm curious to know why guys do that...
Why do GUYS touching each other's crotch? Is it for fun? or... I'm curious?
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