New beginnings

hi there. Just a little about the situation. I'm a 39 year old male. I was married for 12 years and for various reasons the sex dried up to non existent, plus she worked every weekend night, we had kids fine. Because she was away and no sex I was masturbating on a very regular basis and of course the stuff got harder that I watched, anyway, we split 2 years back and I met a new women online and we are in a long distance relationship, we've met a on a semi regular basis every few months. The sex itself is amazing and I'm completely in love and find her very attractive, but I struggle to ejaculate during normal vaginal intercourse. I think I'm to used to my grip to get me off. I'm wanting to try this to see if it helps.