'Hunter's Sense of Touch' (1995) aka Karyudo-tachi no Shokkaku. Dir. Satō Hisayasu. 

A brash, rough sex-seeking homosexual detective investigates a series of brutal slayings that macabrely seems to implicate his estranged ex-lover! The grisly case propelling him ever further into a sordid bacchanal of lurid sexcapades that takes a truly bizarro leap into pulpy Sci-fi with the sadistic psychiatrist's maniacal mind-reading bent! 'Hunter's Sense of Touch' is another fascinatingly intense, unflinchingly graphic, S & M heavy gay Pinku Eiga from the daring, remarkably prodigious eroticist, Hisayasu Satō. This spectacularly seamy, darkly sinister sadomasochistic treat concludes violently with a bracingly visceral climax!! Pinku master Satō's relentlessly gripping, sexually uninhibited Karyudo-tachi no Shokkaku is pretty strong stuff, rated ESP for Extra Sensory Perversion!!!