It&#x27;s not the same argument at all.<p>Why not beastiality? Consent.<p>Why not polygamy? Agency, inherent power inequality.<p>The reason why gay marriage won&#x27;t &quot;degenerate to polygamy and beastiality&quot; isn&#x27;t because people are somehow reasonable and know where to draw the line on the slippery slope.<p>It&#x27;s because there&#x27;s no slippery slope at all.