Regarding fees at xoticbeachhouse
I am not certain if the fees have changed at all, but as of a couple months ago the range was about $4300 USD to $6000 USD for four days and three nights.
Even with the conversion, you would be hard pressed to find a quality lady here who would charge that little for her time. Yes, the ladies do offer FS, and they will spend most of the day with you (if you want them to). You also have the option of changing your companion from day to day.
If you are looking for a 'sex vacation' as you stated, I think that is the route to go. I know when I travel with gents, it is much more about the time and experiences shared in cultural and exotic locals than it is about raw physical pleasure

An hour or two a day at most are ever spent in intimate matters. The majority of our time is spent with cultural growth, physical challenges (the PG kind like white water rafting, diving, zipping, surfing, rock climbing, glacier climbing etc.) intelligent conversation, and attending galas, plays, symphonies and galleries. I would assume most courtesans and escorts here would have a similar way of keeping company.
Therefore, if you are looking at 'bang for your buck' in a literal sense, a resort like this one would likely give you the most mileage.