(I’m in a relationship and have sex regularly)
For me, it definitely helps with nofap but it is again not a solution. if you have sex instead of fapping then it is just equally bad
Having sex definitely should feel different because it is about feeling and not about pushing it in and out.
I think what you are describing is already pretty good. you feel that there is something missing if you watch porn. There is a reason why we are addicted to porn. Often there are deeper issues, which is why we watch porn. We are stressed or looking for recognition. But porn just can’t take away the source of the feelings and that is what you feel when you say that there is something missing.
Nofap is a long journey where you have to figure out why you are addicted. What these thing is that you are missing in life and what gives you urges
For me orgasm during sex and pmo feels totally different. Also while nofap the feeling while having sex changed