Hi I m a 28 year old male and I am married. Both me and my wife are big built. We have not experimented much in sex other than the missionary and the doggy style. My wife has very fat thighs and big buttocks . And my penis averages a 4.5 to 5 inches on erection . This seems to make insertion difficult in some new positions we wanted to try like she riding me while I sit or spooning position. Please advise what other position would work for us or a different technique.