As a courtesy, anything that will fall short of the punter's reasonable expectation should be brought up beforehand, no? It's not a rude and careless assumption to assume that the lady you're about to see naked has tits, surely?
"Just had a boob job - no rough play" or "Recently has a wisdom tooth out so no oral for the next fortnight"; completely understandable, just make sure it's quite prominent in the description and doesn't contradict any advertised Likes. Us punters will part with money for just about anything, so long as our expectations are correctly set.