I have french kissing on my likes list but very rarely do I get asked to do it as I try and do things which take up time, I have read from some men that they won't book anyone that doesn't offer it as they enjoy doing it as part and parcel of the booking, I think this is just alot of hot air being blown. It wouldn't bother me if I lose bookings for services I refuse to offer, It's no use offering services you don't really enjoy doing it will show in your perfomance at some point.
A lot of men spittle and slobber anyway and think sticking their tongue down your throat is sexy if you don't enjoy it take it off your list simple.