I dont see how so many people have issues with the crotch area. Either you guys have huge butts, sizing diwn too much, or wearing them too high. I have noticed a lot of people wear their jeans kinda high like the pic in the previous page with that guy wearing suspenders.
I think its just the way they are cut that makes them have a lot of tension in the crotch. Even when I wear my skinny guys pretty low, when I bend my knees it feels like the crotch seam is pulled with tension at the slightest of movements. No blowouts so far though