Spa Movies?
 

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"TRAITEMENT DE CHOC (Fr/It 1973)
Alternate Titles: L'UOMO CHE UCCIDEVA A SANGUE FREDDO; THE DOCTOR IN THE NUDE; SHOCK
...The heroine herself discovers the potency of the chemical when, after the mysterious death of Hirsch, she halts the treatment after only a couple of sessions and finds herself enduring "cold turkey". The effects of the treatment often
reflect those of amphetamine sulphate with initial wild bursts of energy (illustrated by a bizarre seaweed fight in a sauna) leading to extreme exhaustion...In the UK Traitement de Choc was acquired by maverick independent
distributor and occasional filmmaker (Horror Hospital 73) Anthony Balch who, in his usual manner, retitled the work with the more exploitative The Doctor in the Nude, in reference to a brief scene in which Delon is seen frolicking
full-frontally with his patients on a beach. This sequence took on a life of its own on various internet porn sites, much to the chagrin of the star who mounted a number of legal actions against site owners."