The sex industry is prevalent in the Dominican Republic with a fair amount of strip clubs in the city of Santo Domingo as well as a few in Punta Cana. The strip clubs are not like your typical European or American venues in that most of the clubs have an exit fee where you can then take the stripper back to your hotel.
The Dominican Republic also ranks fourth highest in the world among countries exporting large numbers of sex workers. So, bearing this in mind if you do take a lady back to your hotel keep your valuables locked away and they also try to start up long distance relationships seeking for you to wire them money. They try this on with multiple people to bring in a staple salary, so be vigilant and just try and enjoy the place for what it is.