Erotic massage parlours in Seville (in Spanish: Sevilla) are something you should keep an eye out for. I’d say these would bring the best bang for your buck in this city. The massage is usually great and includes under-the-counter extras.
Elite Masajes (https://www.elitemasajes.com/) at Av. San Francisco Javier, 1, is where people direct you when you ask around about sensual massage in Seville. It’s by far one of the best in the city. An hour including full-service will cost you €150. Good deal. Kaizen (http://www.kaizencenter.es/) at Calle Arjona, 11S, is awesome if you’re into the tantric stuff. Of course you can also browse some local classifieds or escort directories to find some masajistas eróticas (erotic masseuses) or escorts in Sevilla who offer masaje erotico on the side.