Yes they do
After intercourse, a woman's hips widen to prepare for child birth
some boys like girls with big hips....
I'm assuming you meant why are girls hips wider than boys, and the answer is that girls hips widen in order to support a child if the girl were to get pregnant
to have intercourse with them
Gently
Child bearing hips..... They can have children. Or have children with less then a problem.
Women have broader hips so they can give birth more easily.
I have been told that after intercourse, when trying to conceive, it is helpful to elevate your hips(pelvic area) slightly for anywhere from 10-20 minutes.
Bust, waist, hips.
To facilitate childbirth
Have sexual intercourse.
Most females usually start hitting their growth at between 9 and 12 years. During this stage, hips broaden and the breasts begin to develop.
It is enjoyable and lovely