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ORIGINAL: QuietDom

I stand by my tried and true method.  Get the biggest, shiniest red ball gag you can find, with a big black strap and a roller buckle.  Attach it to some 500 lb test line.  Leave the gag out in an area with a lot of foot traffic, while you hide around the corner with a rod and reel.

The most important thing is to not get impatient.   Don't start reeling as soon as someone picks up the gag.  If they actually buckle, it, though, then haul away.

Note that there is no guarantee that a slave caught in this fashion will meet your personal requirements (eg. you may get a male.)  That's no real problem, though; just catch, release, and cast again. 

Also, don't cut the leader if you can possibly avoid it -- the lures are expensive.