20 y/o, pretty fit and healthy. My problem is that I get a raging hard boner very easily.

I could just grab my girlfriends butt and get hard from it. If she simply touches me on some unusual spot, like my inner thigh I'll get hard.

I watch porn/jack off once a day maximum. Sometimes even less. Having sex weekly, work out etc.

Now I feel like it's ruining the fun. My girlfriend doesn't even have to try to get me hard, I'll already be ready. She hasn't complained or anything, it's just that I'd enjoy her trying to get me hard. And I'd like to be able to feel some kind of self control over it.

On the plus side, I can fuck for hours. It won't go down even after ejaculating (EVEN WHEN IVE FUCKED FOR 30 MINUTES). Maybe a blessing, I don't know.

Would you recommend cutting the porn off? Have someone tried? Anyone with similar "issues"?

--TL;DR-- Getting hard too fast. What to do?

Edit; added some reasons.