This is pretty rampant in my city. This is a high enough contact area as is that offering anything further is just ridiculous. I'm very averse to any fluids from my customers coming anywhere near or on me, but saliva especially just really gets me. I also hate it on a personal level in the bedroom, so it squicks me out doubly. Gross. Gross. Gross. You don't know where those titties have been (likely in many other mouths if you're getting away with it) and I don't know where your mouth has been.
One of the dancers I've worked with had the idea of putting hand sanitizer or other foul tasting products on her nipples/breasts to deter customers from doing it; I thought it was pretty clever.


Your breasts, your choice, but you just lost my business.