its as simple as:
is piss fetish legal?
is shit fetish legal? (scat)
is puke fetish legal?
i think thats about as easy as it can be justified as in its a form of extreme sex which borderlines on involving bulemia and oral man, these are new genres of sex.
the GAGGING has been around for awhile and is ONLY associated with FORCED sex, there is NO FRIENDLY VOMIT INDUCING ORAL SEX.
its regarded as forced sex.