Just like any other woman, you just better have some strong hips ;D
because they know you're not there because they look good, they work harder tom please you. What they lack in energy and flexibility, they make for with open mindedness and enthusiasm
Here the man lies dow and the women sits on top, she inserts the penis into her vagina and have sex. the reason is the man may be to heavy for her.
With a Bra.
Makes no difference to the result who takes what position, pregnancy may result.
Cowboy