Polite Nipples 

How in the world do some girls do it? Remain polite while being assertive, that is. I'm the type of person who (knowing my bad temper) would rather feel a bit of discomfort than get a bad review or lose a repeat client. Example: I HATE having my nipples bitten, pinched or touched much at all. Now all these guys who see me do so because of my huge boobs. Well, they all want to play with them, etc but there comes a point after a while that they get SO sore and I can't hardly stand to wear a bra. I always tell them upfront that I like a gentle touch- especially the nipples and that they are VERY sensitive, but that just seems to encourage them more. Sometimes I think they're trying to suck my lungs out! It TOTALLY is a turn-off, but they are seeing me mainly for the boobs, and I just don't know how to politely keep saying "no, no, no" over and over without losing my temper, so most times (like now) I'm walking around putting cow udder ointment on my nips, sleeping (not sleeping well) on my back and bitching about it to anyone who listens. I can tolerate a little, but when I get more than 2 appointments a day, it ads up to untouchable boobs and I just don't know how to be polite about it when my sweet, quiet little "I like a soft touch there" doesn't get me anywhere. I got one suggestion of putting round bandaids over them- haha, but seriously...anyone have advice?