According to an article in Wired, there has already been some Russian research done in this area:
From
tfa
There are no dead man's sticks in space. And no matter how stressed anyone gets, they can't even enjoy a little release by manipulating their own joystick: One of the effects of weightlessness is reduced blood flow to the lower half of your body. The rumor in Star City is that many have tried in vain to get it up out there. "There vas top-secret program of this," Driga says. "But the man could not perform. Viagra vill not help."
So it may not be possible to perform in zero g, not enough blood flow to the lower extremities.