I think you never seen outside world before (no offence ), curiosity is common in asian ppl only.So in general, as an mature adult male/female, we know what it is and why it happen.

"sex is not the only object of curiousity...
so u asking "wat so curious about..." is juz 2 lame... cuz everybody gets curious...
rite...?" 
That's why I said nowadays many ppl still thinking childishly. Maybe because asian country not expose enough on this kind of things. When you grow up in an environment feel with passion, you won't think that it's new to you anymore.