Despite being a residential-style men's spa where sexual services are prohibited, this incredibly popular establishment is famous for its shockingly erotic oral services, making reservations nearly impossible to get. With a repeat customer rate of 101 percent, the lustful older sister-type estheticians deliberately arouse their clients during treatments. Blowjob-obsessed therapists tease the sensitive frenulum with flicks of their tongue, then greedily take the entire length deep into their throats with sloppy, obscene sounds. The main attraction is their expert technique of sucking out every drop of semen and swallowing it all down.