From the Annals of the History of Psychology: Nude Psychotherapy

In the 1960s (of course), psychologist Paul Bindrim, building upon the work of Abraham Maslow, invented a form of psychotherapy that involved everyone getting naked:

Nude therapy was based on the idea of the naked body as a metaphor of the "psychological soul." Uninhibited exhibition of the nude body revealed that which was most fundamental, truthful, and real. In the marathon, Bindrim interrogated this metaphor with a singular determination. Bodies were exposed and scrutinized with a science-like rigor. Particular attention was paid to revealing the most private areas of the body and mind-all with a view to freeing the self from its socially imposed constraints. "This," Bindrim asserted gesturing to a participant's genitalia and anus, "is where it's at. This is where we are so damned negatively conditioned" [...] Determined to squelch the "exaggerated sense of guilt" in the body, Bindrim devised an exercise called "crotch eyeballing" in which participants were instructed to look at each others genitals and disclose the sexual experiences they felt most guilty about while lying naked in a circle with their legs in the air [...] In this position, Bindrim insisted "you soon realize that the head end and the tail end are indispensable parts of the same person, and that one end is about as good as the other.:"

http://people.stu.ca/~nicholson/Ian_Nicholson/Research_files/Baring%20the%20Soul.pdf via io9 | Unrelated photo of Bob Newhart statue via Flickr user Digital Sextant, used under Creative Commons license