This post will piss a lot of you masturbationers off. However, I still must share what I have found to be true about masturbating. Throughout my adolescence I was an avid self-gratifier and would do so about once a day. When I finally got married years later, I was a virgin and hadn't masturbated in about 5 years.
I have found that sex is much harder to "get off" on than masturbating and a recent article I read explains this problem perfectly. In the article (which was on AOL several months ago) it stated that when one masturbates, a new pathway is created in the brain that is associated with pleasure or orgasm. While we masturbate, we are teaching our brain that this is the way we have an orgasm/this is what turns us on. Having masturbated for years before actually having sex, I believe I trained my brain and I am now having to retrain my brain to orgasm through sex.
I hear of many women on this site that are dissatisfied in the bedroom because their husband never wants sex and I do believe masturbating could be the source of their man's lack of interest.
Anyhow, just an interesting thought to throw out there.