Actually, a couple years ago, pink actually became quite fashionable for teenage boys. Lots of guys in my son's Scout troop were wearing it. I don't know if it's still fashionable, or if that trend has passed. However, I would say that ALL my menfolk do not like flowery, swirly, "girly" looking or cutesy prints. They're happy with tone-on-tone, geometric, dots, stripes, checks, etc. Vines or leafy prints are ok if they don't include flowers.