Bustin a Nut with New Dancers versus Older ones

I try to bust a nut during lap dances within the 1st song or 2nd one to save some money. I noticed though a big difference between older dancers (over 25) versus the newbie who just got started. The older ones know when you bust a nut and can either feel it or notice you dick goes down a bit. They tend to slow down and chill with the dance at that point. The newbies tend not to notice and keep going. Just wondering if you all ever mention to the girls that hey I nutted can you please stop grinding so hard. I'm usually just embarrassed and want to roll out but there really isn't a good way of bringing this up.