It's called "grinding" sweetheart, something new kids have come up with now'a days, it involved something flat and frim and someone elses genitilia, works great for us ladies, you should try it sometime. . .
It looks like nothing, fake, to begin with but when you look closer, you see the passion and pleasure in the picture. Them being oiled up, makes the light in the picture highlight the forms of their breasts and curves