I’ve never seen gay marriage as a “slippery slope”, it is a complete break, it is the realization of another libertarian victory to add to the 50 year string of them.
Once we have “gay marriage” then what we are really saying is that it is all up to whatever consenting adults want, polygamy has to follow, as will all other variations.
Yes, because we have a nation run by lawyers. If we legalize all sorts of "marriage," the money from divorce and probate cases is going to be ASTRONOMICAL.
This drive for new definitions of "marriage" started picking up bigtime when stats showed conclusively that heterosexual couples were living together more and more without benefit of marriage. Not a good thing for divorce lawyers.
Gay couples and polygamists literally begging to be married would provide a bonanza for the legal industry. As they say, follow the money.