You cant really know for sure unless the guy tells you... its a big debate over boobs, butts, or curves.
You don't, it's a part of her body, she can feel it.
Many men feel the gluteus maximus or buttocks would be the sexiest body part.
that you can feel it in your body
there feet
Girls have several parts to the body that boys don't. They are parts to do with reproduction and child birth.
No. There is much more to it than a body part.
Her BRAIN and BUTT
In the same parts as boys
Feet
breast
Well to me it is the privites. I know its weird but that's just my opinion.
by studing the human body