Well, there is no specific Biblical prohibition against it....
I do it quite often myself, and though, yes, I have to fight off sexual thoughts, I don't intentionally give in to them... the only time I was actually and truly convicted by the Lord was when I intentionally gave in to sexual thoughts a few months after i was saved back in 2006.... I was horrifically convicted until I truly asked the Lord for His forgiveness....
As for wanting to quit it... I have tried several times, because I was wondering whether or not it was a sin... but it really is almost impossible for a guy to quit.... after a week, the build up is so great, I cannot sleep or function in my daily activities properly.... if I don't do it, then my mind will go to sexual thoughts after a week.
So, based on what I've experienced with the Lord, I believe it's something that can be legitimately done as long as you're not intentionally giving in to lustful thoughts... and it can be done.