I wouldn't mind if girlfriend wanted to pose nude.
It's her body, her decision and the in the end she'd come home to me.
Yeah, there are a lot of perverts in the nude modelling class, but aren't there perverts just about anywhere. It's nice to see a girl posing nude, but after years of "practice" I can imagine just about any woman I meet buck ass naked.
In the end, she may be nude for them, but she's coming home to me.