I have never been in a lap dancing club in Dublin but I have been in a few on the continent. As far as I could gather if there was sex on offer you were going to pay a fortune to get it and I am not sure that most of the guys who were brought into private booths were not paying to be teased with nothing at the end. Obviously if that is clear from the beginning then no problem.
To be honest I was never very fond of the lap dancing clubs as the girls sat down beside you and got very annoyed if you were not buying them drinks etc from the off. So, not something I would recomend.