Asking other people for nudes and sending nudes while in a relationship is cheating. Some people may say it's not so they can feel better about what they're doing. Unless the couple has actually agreed with each other that they can send/receive nudes from other people, then it's cheating in my opinion.
Well only assholes who cheat say that kind of stuff. So not guys, just the guys that you've met. Maybe start hanging out with nerds? We treasure our girlfriends and love them forever. Just as long as she doesn't cheat on us or treat us badly.