Yup! Not to speak negativey of DM(I don't think he actually said he believed it, just that someone posted it), but too many people buy into any type of statistics without even thinking about them. This "47%" figure isn't even close to being believable.
My dad told me that the first time I screw a girl she'll probably get pregnant and then all of my college hopes will be gone. He also said that if I ever try any drug even once I'll instantly be addicted for life or until I OD. There is actually some value to these scare tactics. I might have to use the STD one on my daughter :-)
There is until it is disbelieved, then it becomes counter-productive because your credibility on all other issues is squandered.