Compare her holes. I collected several photos of my girlfriend's vagina and anus to see the difference between the two holes and to see the difference between an aroused vagina and a not.
Each token is about 5-10 cents and you can tip 1 or as many as you like. Every token amount has an effect of some kind on the performers."
The tokens vibrates the toy remotely which is usually already inside the woman. So your 5 cents makes her shiver. After awhile, she does something extra (sexy) special ...