this is an image that shows the internals of peoples bodies. why include the legs when the intention is to see inside their pelvis'?

It's a cross section. So the other leg of the receiver is behind the giver and the giver's one leg is visible, it's just all muscly.

You can see the mans leg muscles on the right. The womans are bent up diaganolly to the right but they are out of focus of the scan probably.