My new running shorts just arrived and I wore them out jogging today. I was told by several passer-byers in cars that they could see the crack of my ass through the shorts. I thought these shorts were made for being worn alone without another pair of shorts over them. Is this not the case? If no, then why is the material so thin that the crack of my ass is able to be seen through the shorts? That just doesn't make any sense. Anybody else have this problem?