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a crazed obsession with body parts and rutting is 'responsible?"

Body is an individual property, nobody can tell you what you can or can not do with your own body. Take a look on www.myfreecams.com!

I think the better term would be "adolescent fantasy'...nothing adult about it.

Being adult is not related to age, it's about what you think about your life and nobody can say or determine on what age someone could know what want for his own life. Sometimes people over 40 act like teenagers and sometimes 14 age guys act like 60 age ...