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Well, I read the article and have one key thought. The masturbation is a normal man's activity. It's frequency might be different depending on hormone levels, right? Correct me if this assumption is false.
If so, is that really related to masturbation or the hormone levels themelves? I think of that because the final message sounds like it is wrong (risky) to masturbate rather while I think it should instead sound like having sex, or being more precise having erection, is wrong (risky). Shouldn't it be said this way first and afterwards masturbation might be pointed out just as a factor of man's sexual life?

All the survey looks pretty cheap to me or hasty at least with it's conclusions. What is an issue here is that such practices (I mean the survey not having some pleasure) may have a negative influence on men in terms of unnecessary stress.

I'm pretty surprised that scientists do such things. What do they gain from being so?
If truly this is more masturbate related issue and not the hormones, why nobody has explained how? Give some light on the dependencies, please. I mean, what is so crucial in the men's hand moves that a cancer might come out of that?

Let's be serious and responsible. A survey with such conclusions I could do myself even though I have nothing to do with science except for that it's very interesting - when it is a science.

Bart