Even holding the hand of somebody you love is 100000x superior to porn.
I've discovered that interaction and bonding with the opposite gender is truly a beautiful thing, and it's really good for you in so many ways. A girl doesn't even have to be that good looking, in my honest opinion; you just need to love her and care for her, and for her to be a good match for you. Synastry can help with this, in astrology, if you know her birth date, time and location.
Even having "that moment", where you see a girl you like and you both smile at each other, despite being strangers, is beautiful. That could be the start of something, you know?
Once you experience this, you'll never want to go back to porn, and it will motivate you to develop healthy and happy sexual relations with others.
If you don't have somebody, imagination and fantasy is still superior. Plus, this approach will strengthen your visualization skills, and it can be used to further a goal you desire (e.g., sex magick).
I also agree with the suggestion of tasteful, sensually-erotic photography/artwork. This is superior to porn, as it's a genuine expression of beauty and not something that's just supposed to be material to get off to and rot your brain.