It exists to make poker more challenging, for verisimilitude, and to add a counter-effect to being able to cheat via vibrations. The foreshadowing is the description of the existing dealer + the entire tone of the company/party.
Hmm, well:
* like mentioned, it doesn't make the game more challenging; there's no challenge in clicking "get a drink" button instead of "ante up" button, when it's rendered a mandatory action to avoid arbitrary game over
* having to chain-chug alcoholic drinks to avoid magical orgasm that knocks you out seems like the opposite of verisimilitude, since none of this concept feels "true or real" (benefitting from one or two drinks over the course of the game? i could maybe buy it, minus the magical orgasm part. But getting pretty much attached to the dealer's tit just so you can stay in the game? nope, sorry; that's just silly)
* i think you're vastly overestimating the usefulness of cheating via vibrations; it gets you very limited information about a single participant, and in later part of the poker game it gives you none, since the cheater is tracking the PC (or has been eliminated) Effectively you're attempting to penalize the player even when they don't benefit from what they're supposedly penalized for. Not only it is an unbalanced design, it also means the player
has to "cheat" just to stay on what's the "difficulty baseline" so to speak.
* the description of the dealer absolutely doesn't foreshadow anything in my experience -- i've chalked up their appearance as an understandable move to prevent them from providing hints to game participant(s) and thus potentially rigging the game. The dealer also appears to be able to move freely, when she delivers you drinks etc. At no point it creates any impression they're someone who'd passed out at the table and got turned into a helpless puppet against their will. The entire tone of the company/party actually works against you here -- having your employees gagged and in gimp suits is so par for the course, it doesn't serve as any sort of a warning.
(i realize it's a wall of text at this point so don't worry, i don't expect you waste your time on replying to it; it's just a bit of unasked for feedback)