I also pray to Nut and Geb. They are the proto type for Isis and Osiris.
Most religions associate man with sky and woman with earth. The Egyptian reverses this. So Geb is usually depicted as someone lying on the ground, having been pushed to the point of exhaustion by woman on top sex.
en.wikipedia.org
Here for example, Geb is the man on the ground, and Nut is over all of them.
So this continues in the Isis Squat over Osiris and being able to conceive Horus. I interpret this of course as not being an actual conception, but instead as leading to a spiritual rebirth. And some do see that this is the meaning intended with the emphasis on the woman being on top, that these lead to spiritual rebirth. Some also see East Indian Tantra as having originated in Egypt.
SJG