Can't really blame him. They say "Don't stick your dick in crazy", but let's be honest: crazy chicks can give one hell of a time. Just make sure not to pick the really crazy ones unless you know you can handle it.
@Soulkenshin At least there'd never be a dull moment with the crazy ones. I'd have no problem getting with a girl who's a little unhinged, so long as she still knows right from wrong and can keep a lid on it when needed.