Your comments

If knots are included, it would be fun to see a knot stuck in the muzzle of the one sucking it (oral knotting).

Would it be just the character that is bound to the rack that is dressed up, or would the one conducting the experiments also be dressed up? A French maid (either female or crossdressed male) could be operating a milking machine on a male subject, making her (him) a "milk maid" :D I can also picture a classic dominatrix outfit here.

What kind of electrodes do you intend to include?

If latex bondage is chosen, I can easily imagine rubber sensory deprivation hoods, complete with blindfold and (cock?) gag as part of it. I think the hood would cover the ears too. Gas masks would figure in too, and the air supply could be laced with pheromones.