I think low volume is more about attitude and behavior than a number. What's the point in even asking or trying to define a number when it varies so much from person to person, day to day, and you're never going to get the real number anyways? I see low volume girls, but that means to me:
You can actually talk to and make a connection with us, instead of just laying back and letting us do what we want. Maybe you're tired from seeing too many guys or doing some other stuff, or you just don't like to talk to us. Maybe some guys dig that, but not me.
Having some flexibility on time. I'd like to be at every appointment exactly on time, but traffic is unpredictable, meetings and other obligations can go longer or shorter than expected, etc. I'm honestly early about as often as I'm late, and I'm willing enough to wait around somewhere if I'm early. On the other side, it's a turn-off if you're jumping down my throat because I'm 10 minutes late when we have an hour. Are you trying to hustle me out the door to get ready for the next guy, who you booked to show up 10min after I leave? That's not what I'm looking for.
And I hope we all know that nobody wants to see any evidence that another guy was ever there, as far as sheets, condoms, towels, etc.