This intercourse position is most widely used. Many people like it because it is easy and there is a lot of body contact.
The girl lies on her back and the guy lies above her. He should not put all his weight on her so she’ll not be completely restricted in her movements. He can best support himself on his hands/elbows and knees.
Entry of the penis is easiest if the woman guides the penis into her vagina, because she can feel the location of the opening and determine the proper angle of entry.
The woman can move her legs and hips to change the depth and angle of penetration.
In this position the guy controls the thrusting, slowing down or speeding up. He also decides on the kind of movement, like back-and-forth or a circular screwing motion.
This position is not the best for allowing men more control over their orgasm. Usually, better control can be achieved when the girl is by his side or on top, such as in the Amazon position.
Many couples have intercourse in the Missionary position even though this is not their favourite, just because they are afraid to express their preference to their lover.

Clitoral stimulation in the missionary position: how to do it?