A woman was created by evolution in order to continue the race, so her pelvis should be wider, and men do not need this, because their large pelvis will interfere with hunting a mammoth.
The question, of course, was asked incorrectly, since not everyone has it.
In general, the matter is in the amount of adipose tissue. In women, it is normally much more than in men (due to procreation), therefore, the female forms often look more rounded.
However, in a "dry" girl, the fifth point will resemble a man's.
Also, we must not forget that girls can be square genetically.