Undoubtedly there are those who can, though it takes extreme discipline.
Fot the most part, I agree, however.
Of course, then we have to ask the other question: is it
good to put that much control on it? I'm not saying that you should just do whatever, but sexual desire is a perfectly normal phenomenon. I don't see how it makes you a worse person to listen to the desire; it's not as if it's like smoking, where you're gaining something by not doing it. In fact, some studies have shown that not having an orgasm for an extended period of time can lead to an increased risk of prostate cancer for men, so you're protecting yourself from cancer by masturbating.