Coworker always 'accidentally' touches my butt?

Anonymous
It's hard to tell if it's an accident or not or if I should say something about it. It happens pretty often but not everyday. He always says something like "Oh I just touched your butt, sorry." And I'll just say, "it's okay" or "no worries", but I am starting to wonder if it's on purpose and if I'm being too nice about it. I have a boyfriend, he knows I have a boyfriend, so I don't know what to do. I don't want him thinking it's okay to touch my butt, but I also understand it's easy to bump into people and my butt does stick out some. So what do you think? Accident? If it helps, he's 18 and I'm 25.
It's probably just an accident, maybe he bumps into everyone.
It's probably on purpose, he's just trying to touch your butt.
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Coworker always 'accidentally' touches my butt?
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