Something we don't like: Making up phony "science" when the real science doesn't fit your worldview. A fellow I once worked with feared nothing more than hearing that his 16-year-old daughter was having sex. I don't think he was as afraid of her having sex as he was of hearing that she was having sex. Whatever the reality, he wanted to be able to pretend she was still a virgin and would be until the night of her first marriage…maybe, her second.
So he kept asking everyone at the office for advice: What could he tell her that would scare her into not going all the way or even part of the way? Truth, which is what most folks suggested, was not an option. Truth might not lead to abstinence the way a story about how adultery causes blindness might. So he filled her mind with fables about how no birth control method ever worked and how out-of-wedlock sex caused Parkinson's Disease and we all felt very sorry for that young lady. One secretary said, "Watch. She'll be pregnant by Christmas." Another said, "She's going to be very screwed-up about sex." I never heard what happened with her but both would not surprise me.
Amanda Marcotte reviews some of the altered science the so-called "pro-life" movement has spread. Read it or you'll get HIV.