Still No Good Reason to Deny the Right to Marry

In August of this year, Tom Head decided to respond at thoughtco.com to "10 Really Bad Arguments Against Same-Sex Marriage" by the American Family Association. Since the limited monogamous same-sex freedom to marry was legalized over two years prior, I'm not sure why this was published  in August, unless it was intended for people in Australia or other places that need to get moving on marriage equality.

Unfortunately, Head throws ethical nonmonogamists who want to marry under the bus with this one...

Argument #2: Polygamy Will Follow If Same-Sex Marriage Is Legalized

Whether or not there's a connection between polygamy and homosexuality, there's been no proof of this since same-sex marriage was legalized in June 2015. Even if the concern had a rational basis and polygamy rates were to suddenly spike, there's a simple solution – propose a constitutional amendment banning polygamy.  

Head's response to what is essentially Discredited Argument #7 should have been "So what"?

What's the problem with letting an adult marry any and all consenting adults? That's called...

E-Q-U-A-L-I-T-Y

As we see, there is no good argument against full marriage equality. Let's stand up for the rights of ALL adults to have the relationships to which they mutually agree.