Just like they say with starting a business, it's all about: LOCATION, LOCATION, LOCATION!
So, find out where the type of women who would cuck a dude are, then go there, spend time there, send off subtle hints, vibes, signs, get in convos, come on stronger with your intentions, cross your fingers, let the good times roll.
If finding where the type of women who would cuck poses a problem, break it down to the previous level, find out where the type of women who would CHEAT spend time, then go there. If she would cheat, with no problem, no guilt, I mean regularly cheat as in it's nothing out of the ordinary for her to fuck around on her boyfriend, then she is probably more willing to cuck than a typical woman who won't cheat or who at least has guilt or a problem with cheating.
Maybe try strip clubs. They're used to men hitting on them probably, but not in the manner you will do it. You'd probably find a good share of the strippers willing to use you as their little bitch, put you on clean up duty, run errands for them, spend your money on them, etc. Try it out. Come on to a few of them, but in your own way, letting your unique intentions be known. You'll be cleaning up stripper pussy before you know it. Licking that stuff off her tits and face too. Even on nights she doesn't have a "date," she'll still be plenty sweaty from dancing her ass off. Yeah, sure she took a shower before she went into work, but come on, dancing for hours in a row, that ass is gonna be sweaty when she gets off. And guess what? That's right, there's strippers out there willing to let you, you lucky cucky dog, lick that sweaty ass crack. Now put your tongue back in your mouth, stop panting, and hyperventalating, and go out there and get 'em big guy!