I wouldn’t have thought you need to advertise “you don’t have to have sex with me”. If a client is happy with just oral or whatnot then he’ll either brief you before hand or just won’t engage in sex during your meet. I have plenty of clients that don’t have sex with me but I’ve never advertised or marketed towards this, it’s just their personal preference.
They all pay my full fee and I’d never think to lower it just because of no sex, with everything else included. To me, my time is my time. It’s up to them how they use it.
If you’re wanting to offer a reduced fee for non-penetration then maybe something along the lines of “I allow a small discount for non penetrative meetings” but you will have to set your own boundaries for this, obvs.
Personally though, I don’t think you need to offer a discount