Flexible men! Photographer David Aden Sprigle, has conducted a 10 year photographic essay of naked young men in the classic yoga pose Ananda Balasana, also known as "The Blissful Baby." Each man, in this happy state, reveals an expression that is uniquely his own. Vulnerable, intimate, beautiful and very sexy, each photograph conveys the many moods of this private position: joy, power, humor, fear and openness. Bottoms Up, Boys! Pictured here are 5 of the 111 beautiful yoga boys in the complete book.