Where it comes from
Slowness as method has a traceable lineage, the Californian bodywork schools of the sixties stripped massage of its clinical goals and rebuilt it around uninterrupted presence, and every honest sensual menu in Europe descends from that experiment. Amsterdam's contribution was to stop being coy about the adjective: in a city that put desire under a lamp rather than under a rug, sensual could mean what it says, and the technique kept its dignity precisely because nobody had to pretend it was physiotherapy.