Its a trademark, like nike or cadburys or burberry or vauxhall. How can a playboy bunny emblem on a pencil case encourage promiscuity or encourage lap dancing or porn or stripping? OK, i can understand your viewpoints if they were giving away free sample mags with every purchase or recruitment forms, but on its own its pretty meaningless, just an act of consumerism to show off a designer label.
Nike has a good record for child expoitation in its factories in places like China, when children go out looking for new trainers do they think child exploitation when they see Nike trainers or buy Nike trainers because they support child exploitation? I don't think so, many are ignorant and naive and most adults aren't that much different. So are children going to be any different about buying a pencil case with a softporn empire logo on it? If we buy kids pencil cases and folders and pens with car manufacturers on them, is it going to turn them into boy and girl racers?
I have to admit i was a bit creeped out with the mistermen girls underwear with a slogan like 'Mr Tickles, because girls like to have fun,' but again, that was aimed at young children. Even then though, chances are that they're not going to understand the significance of masturbation or sex, plus it didn't even encourage sex in any way, its pretty innocent but people read too much into it. Personally i feel people are overreacting slightly.