Unlike, perhaps, other relationships of dominance and submission, there is no one way to engage in pup play. Welcome to the kinky world of 'pup play': A subculture of BDSM in which mostly men act like young dogs decked out in gear that includes a colorful array of masks, hoods, muzzles, collars, leashes, mitts and tails, and sometimes coupled with brightly-hued knee socks stamped with paw prints. Other moments, they are flat on their backs, cuddling. Sometimes on all fours, tongue out or playing with toys such as balls and Frisbees. They romp, growl, nuzzle, whimper, bark and wag their tails.