That inability to stop is the best reason for we fathers to teach our sons to respect the initial "no". For that matter, teaching them (and our daughters) to abstain until marriage prevents many problems (except of the kind that this article brings up.)
It all starts with a kiss. And then 'French' kissing, then hands on, then mouth on chest, etc. down the slippery slope.
I tell them "Hey, do you realize what you just did with what will probably be some OTHER man's/woman's mate? Do you want someone else doing that with YOUR's?".