I wrote a post with that title over two years ago, and I still get a zillion hits coming from that search string. I find it depressing that so many people ask that question. Why? Because they don't look *any* way. They are all ages, weights, races, heights, incomes, eye colors, and manners of attire. Let me reframe it: if 1 in 6 women is raped or attempted-raped in her life, and most rapists assault an average of 10 women in his life, then 1 in 60 men that you know is a rapist.
One in sixty. Look at your facebook friends list, or around your workplace, your church, the bar you go to, and you'll probably see a rapist. He might not even *think* he's a rapist, because he thinks that pressuring a woman until she gives in, or raping a woman too intoxicated to give consent isn't "really" rape, but he is.
A rapist looks like your neighbors, your relatives, your acquaintances, your coworkers. I'm sorry to say it, but I speak as I find. You can't see them coming down the street. They don't wear crazy-rapist shirts or come with warning labels. I wish they did. I wish we could tattoo "rapist" across the goddamned forehead of every dickblister that rapes a woman, but unfortunately we cannot.
Do you want to know how to prevent rape? Get dudes to stop raping women. Here's a handy primer that all men should commit to memory:
I got yer rape prevention email forward here.