I'm sure this happens quite often. I remember in middle school (grades 6,7,8) that one of the coaches would circulate throughout the locker room and make sure every guy got naked. He didn't bother to check to see that anybody actually took a shower. Very few did take a shower because there was so little time between taking the shower and going to your next class that your clothes would be wet when going to your next class. The guy was a mega pervert. It was even more interesting that in high school (grades 9,10,11,12) almost nobody took a shower and the coached didn't give a damn. Grades 6,7,8 would be ages 11,12,13,14 and grades 9,10,11,12 would be 14,15,16,17,18. People getting sexually aroused by guys 14 and under have a problem - pedophiles. I would say that most guys are not sexually attractive until about 19 years old. I think the youngest guy I can think of that looked attractive was 16.. but even then, I didn't see him naked. He probably looked a bit awkward naked.
What is even more weird is that some people get turned on by looking at naked girls! I have no idea why, but it DOES happen!