Call me naive but I doubt it.
This whole "slippery slope" argument from Homosexuality to Bestiality doesn't really work when trying to use that future outcome as a warning. It doesn't seem plausible, and it also compares a human relationship to one with animals.
The way that argument works is a logical device pointing out that according to the rationale used to make Sodomy legal (Lawrence Vs. Texas), all of the other taboo behaviors could also be legalized. That would include bestiality, incest, bigamy and others.
This argument was actually used in the dissenting opinions of the minority in that decision.