A little of both. You can tip the dancers anytime - while they're walking around, on the bar, on a box, etc. Some are more chatty or aggressive than others. Some you need to approach if you're interested or just want to tip. To go in the back for a lap dance, the rate is typically $20 per song, paid to the dancer at the end of the lap dance. It's STRONGLY recommended you confirm that rate with the dancer before you go in the back or if you're expecting anything else. Some ask in advance - how many songs do you want? Sometimes I take the lead and say - I'd like X number of songs please - so they know what I'm willing to give them. And if it extends while I'm back there, it's decided in the moment. But typically once that little exchange is done and out of the way, then you can just sit back enjoy the dance.