What's so offensive? You pay her to pretend to like you ffs!
I must say I was beginning to dispair with this thread until this comment. If you think the whore/punter relationship is anything other than a gash for cash financial transaction then you're at risk of developing soft downy fur.
Those limericks demonstrate the opposite of fluffiness, and those who are put out are leaning towards the notion that it should be more than a financial transaction. It isn't, so have a word with yourself, get over it and be thankful these WG are delivering a useful reminder.
The only real thing to get angry about is when gash (as a metaphor for whaever you're paying for) for cash is not delivered. That's a key role of UKP, to expose poor services, bad VFM, and downright dishonest or high risk providers; but not to challenge the fundamental financial model of this game. Otherwise play on Tinder.