My wife and I are both quite heavy. Our size, plus my rather small penis and my wife's loose vagina, makes it difficult for us to have satisfactory sexual intercourse. I don't get enough stimulation, nor does she.
Our favorite position for mutual satisfaction is for her to lie on her back, knees spread and pulled up to her belly. I get on my knees as close to her as I can. She holds her knees up and spread. I insert three fingers of my right hand into her vagina and stimulate her g-spot, while the thumb of the same hand massages her clitoris. This position allows me to see her breasts, face, and genitals. She usually orgasms several times in just a few minutes. When I can't hold back any longer, I use my left hand, lubed with her juices, to rub my penis until I orgasm and ejaculate on her belly and breasts.