Mine can. His legs are pretty small since his injury though. He's suffered a lot of muscle loss. But actually he's always been able to cross his legs. Just wondering.
I wanted to add this:
I think he sits like that because of his injuries.
He's pushed the ball joint of his hip up thru the hip, broke his femur, jacked up his knee causing chronic pain, and his pelvis is jacked too. Now he hurts all the time.
Although I still don't think its "sissy" or "not manly" to sit this way.