All the MKP secrecy stuff, mainly comes from the techniques of the LGAT seminar, which are highly advanced seminars used in group persuasion. MKP has copied many of the LGAT seminars in the market.
These are mainly used to distract people long enough to liberate their money from them.
MKP hides behind the secrecy of tribal initation rituals, to try to keep what they do secret.
Stripping people bare physically, is a common technique used in these wilderness LGAT's as part of the process of breaking people down.
As far as the sexuality, there are many conflicting reports, for example, some activists from the gay community went after ManKind Project, for promoting the bogus and discredited "reparative therapy" (techniques to attempt to change a person's sexual orientation).
December 01, 2006 [
gayspirituality.typepad.com]
Perhaps others who have attended the MKP seminars can comment on this, and what goes on.