This week, the evolutionary scientist Richard Dawkins tweeted this to nearly one million followers: "Date rape is bad. Stranger rape at knifepoint is worse. If you think that's an endorsement of date rape, go away and learn how to think." Before that, he had tweeted: "X is bad. Y is worse. If you think that's an endorsement of X, go away and don't come back until you've learned how to think logically."Interesting for me, because - there's no subtle way to say this - I know exactly what it's like to be raped with knives involved.