NKD Naked Spa

NKD, also called Naked Spa, is a liberal spa club in the Retiro district of Madrid, about ten minutes from Atocha station. It combines a spa with club areas and themed hot rooms, and runs separate sessions such as Swinger nights for couples and singles, Open Bi, Only Girls and Only Guys. Couples must enter and leave together, consent is required before any contact, and breaking the rules leads to permanent expulsion.