It's really not that bad the majority of the time. However, you train yourself not to have a reaction to stuff... because if you are particularly offended by {extreme porn, seeing penises, people criticizing your favorite team, taking "your mom" jokes to heart} that's an easy button for someone to press if they get bored.

Submarines are pretty unique places in that every person is pretty critical in an emergency. So while it can be brutal at times, it's also pretty collegial.