It doesn't bother me as I've heard worse but the offensive part could be if you were hoping to bother someone. I mean, of all the words in the English language to describe the act of trading money for affection why'd you choose one that, judging from your question here, you knew had the propensity to be offensive to the very population most likely to read it?
It doesn't bother me but it does give a slight impression that you were hoping it would- and THAT is ever so slightly offensive.