(This is asked after you’ve been clear on the first date that you don’t casually sleep with people.)
Scenario 1: It’s asked on a date in a space you can’t leave (like in his car).
Scenario 2: On a date but you can leave the space (e.g. a restaurant).
Scenario 3: On the phone. (Do you just block and delete?)
Scenario 1: Well he has shown his cards to be a man looking for a quick lay or for a kinkmesha who will deal with his "kinks" (aka sexual perversions increasing in intensity due to whatever porn he is watching at present). Disgusting! A man who valued you and saw you as a high value woman would be afraid to scare you off with this nonsense. We know LVM respond badly (and sometimes violently) to sexual rejection. Because you might be in danger here (in his car), I would say "I take a bit of time to figure this out but I should know by the next date" with a cute smile. And then go home and...................... block delete. That being said, do not go with him in his car until you've known him for at least a month. He should also not know where you live or work before then either.
Scenario 2: A date that wants to talk about sex over dinner can absolutely fuck off. I would honestly probably say, "Hm, let me think about that for a minute! Excuse me for a second." Get up and leave. Block and delete.
Scenario 3: Do you just block and delete? Yes.
If he wants to know if you are sexually compatible early on, then it is a block and delete or remove yourself from the situation when you feel you are safe and able to do so!
Also if you are feeling unable to leave, then you can always say that is not something he needs to worry about in the present. You will decide when you are ready. Or you will get back to him when you feel the timing is right. Anything to delay the conversation until you can leave safely.
Always put your safety first!