D.O. is Dionisio Heiderscheid, an Argentinian fashion model with stunning abs and good looks who turned to gay porn and made some impressive movies with Black Scorpion Video. He then left the scene for a while, only to return bearded and even more impressively muscled with Raging Stallion Studios. He was later named their Man of the Year at a ceremony in 2010. D.O. was born in La Plata, competed as a gymnast as a boy and studied advertising. As well as modelling for magazines and fashion designers, D.O. appeared on several TV shows in his native Argentina and became a national celebrity. He sa…