Invoking Eros: Naked Yoga 
Pahoa, Hawaii, USA
Dec 27- January 2, 2016
$1234 USD
Go here if you're looking for: A brotherhood of men, embrace your erotic confidence. 

Company: Gay Naturists International

Location: MANY!

Dates: Various

This is an organization of gay men that host naked retreats all over the world from South Africa to Thailand to Canada. Their missioin is to promote naturists outside of sexuality for gay men and provide events for them to embrace their nudity. Instructors vary from event to event.

http://gaynaturists.org/yoga/retreat/

Company: Bryan Harrelson, Naked Yoga for Men

Location: Various

Dates: Various

Bryan began his yoga practice with Ashtanga Yoga and then later switched over to and fell in love with Anusara. Bryan hosts several nude yoga retreats every year all over the world and resides in San Francisco.