Reviving this thread in case anyone has anything to offer regarding Porto in Portugal. Going there on business, and hoping I can find some amusement on the side. So far it doesn't look too promising.
This is apparently the most trustworthy link to web escorts there:
http://www.apartadox.nl/acompanhantesPorto/About 120 km away in Spain is this place reputed to be FKK-like although the website only hints at that:
http://www.hotelclubpeinador.com/