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.