Hi Ford, I think this problem steems from masturbating
and you used to much pressure when you were masturbating, next time your having
sex switch to doggy style, two ways get your wife to keep her legs together as this will give more pressure, or taken that you have a foreskin, with two fingers hold your foreskin back exposing the head of your penis, your find that the extra friction that this will cause will help you ejeculate, works for me every time.