OKey... here is a technique.. but u gotta learn them in ur own..

when doing misionary- with ur hands squeeze gently her butt cheeks or ass cheeks ... until you feel ur dick in pressure.. tis pressure will make her feel ur more bigger and she will feel everything .. with this u r closing her vagina to cover ur penis :) this is insanely awesome for her.. when u do this u will thank me :) learn the body and be smart