I don't allow clients to finger me or use toys on me as they're both solely my thing, so I get that. I don't mind receiving oral.
Personally I'd uncheck the RO box and leave MF bookings on; you can discuss this with potential clients. I think its probably the same for most of us where you want to speak to the woman on the phone to make sure she is fine with it etc - so personally, I would say then that I'm happy to receive oral from women but not men.
If you see single female clients, I would imagine they would probably ask you that question anyway if it's unchecked. If MF bookings are a big part of your client list, you could perhaps add a tab, but personally I think it may be easier to just discuss it with couples directly.