This!! At least with a snake (something most people are at least mildly wary of, if not outright terrified) you can learn to read markings, check the shape of the head and eyes (non-venomous ones are rounder on both counts), but with men, there is no tell tale sign - until it's too late. What about that is so hard to understand? Must be all those pesky emotions getting in the way for those guys.