Never.
I think that I've allowed one of my male friends to hug me once, when I was considerably upset over something and they pretty much forced it on me---oh, and there was one unwilling time where a group of juggalos blocked me from walking out the door unless I hugged one of the males--it was disgusting, and I attempted to kick them in the balls but what ended up happening was far worse. And then, My female friends used to try to hug me all of the time, but after I spit on them, they stopped. My mother wants me to hug her, but I decline and give her a handshake.