It's good that he gave you the okay.
As far as the feeling goes, it's different for everyone. And I imagine it's hard for him, to understand so quickly, why someone would hate their own body. People usually don't get this stuff right away, so it's only natural that's he's asking these questions. In fact, I'd say it's a good thing that he's so curious, but then again, I'm assuming he's taking it well.