Should I report him for sexual harassment?

Every Sunday I work with this guy. He can be really really nice sometimes, but usually when he wants something. The rest of the time he’s a bit of a dickhead. Not just a bit actually, he’s a huge wanker. He’s mean, racist, and gets other people to do stuff for him when he’s just too lazy to do it for himself. He always says innappropriate things, a lot of sexual inuendo and just outright not nice things. Last week he hit me on the arse, not with his hand but a piece of cardboard as he was walking past. I heard that if a man touches a woman anywhere other than the elbow without her consent then it’s sexual harassment. The thing is, he does actually know his stuff in the workplace and the company is really short staffed at the moment, two of our top guys are leaving and we’re really desperate for all the staff we can get. I don’t want to cause another loss to the company and it’s only one day a week, and it’s not as if he’s coming on to me or anything, so I can put up with it though I feel uncomfortable. One of the other guys heard what he was saying to me today- something about shoving a vibrating back massager that we sell up my you know what- and told him to knock it off, and wants me to ring up the big boss and report him, and said he would testify for me, but he was laughing as he said it so I think he thinks it’s all a big joke. Our current manager is leaving this week and I won’t be back at work for two weeks because of exams, so I guess I could just mention it to the new manager when I’m in next so he could keep an eye on it, instead of making a big deal about it.

Anyway, the point of this rather long rant is that I value all you Flutherite’s opinions and I was just wondering what you all thought about this!