Does it put you off meeting a girl if she stipulates one cum in half an hour or say two in an hour?
I just feel like it adds a bit of pressure, makes it more like a service and if you use your quota early, for instance within the first ten minutes of a half an hour punt are you outa there?
I know personally I might just manage one in half a hour, but there might be the day when I could go more, just the option wouldn't be there.