For the record, I want to state that I am in no way neither condoning or endorsing prostitution in this post. The larger tourneys draw a number of world class players. Be careful. Of every male sex workers, 6 have syphilis and 7 are HIV positive. If you travel here for an adult getaway, I would urge you to check out the hotels mentioned above as you will be far safer.
This is a truly nasty and very high risk area and your chances of being hurt are very great.
I discuss gay travel elsewhere so I will just say that there are a goodly number of gay hotels and at least one hotel that caters to lesbians. Costa Rica maintains a zero-tolerance approach to engaging in sexual activities with minors.