From the press release:
Equus
by Peter Shaffer
A young stable boy has blinded six horses, and no one knows why. The presiding judge commits him to the care of world-weary child psychologist, Martin Dysart. What follows is a tumultuous journey into the human psyche that will forever change both doctor and patient.
On the Curio Main Stage from January 23 – February 16, 2013
*This play contains nudity and profanity, it is not suitable for children.
4740 Baltimore Avenue
Philadelphia, Pennsylvania 19143
Phone (215) 525-1350
Email company@curiotheatre.org
Website http://www.curiotheatre.org
MALE NUDITY in NEW YORK STAGE 
Saw this in Philly Sat. First time to see Equus in the Round. Has the usual end of second act male nudity, with a good looking guy with average junk. It’s best to sit on the section furthest from the entrance.
Next known Equus is at Florida Atlantic Univ. in Boca Raton Feb. 15 – Mar. 18.
Naked Boys Singing is in Indianapolis now thru Mar. 2.
Thanks for the info 4030dale!