Hi K., the way I grew up, us kids would only see parents' private parts occasionally, usually by accident, as they would never walk around naked or show too much skin purposedly. When accidentally, I would walk in my mom or dad getting dressed, you could see them being embarassed and cover up quick, so, even if i was a little girl (probably 5), I knew I had to leave them alone.I was still curious, and asked my questions later, they just answered with simplicity, the same way you do.I think is good to leave something to the imagination (provided you keep giving your honest answers and guidance upon request - there's nothing worst that having a parent intruding when you can't care less), in my opinion it makes up for a healthy curiosity about this wonderful thing called sexual identity. If I were in you, i'd just "redirect" her gently when she wants to touch and will stop talking about the subject for a while (or keep the answers short anyway) so that she can get out of the temporary fascination that is causing her to "obsess" a little.Have a great day!