Second, the Perry plaintiffs want acceptance, and testified that they want to marry in order to feel "validation" for who they are. They want to "experience the same joy and happiness" as married couples. They further say that "there is no way to describe how it feels" to not be allowed to marry and that they feel "not good enough to marry." Polyamorous people have also desire "acceptance" and to be able to "live together openly and proclaim [their] relationship." They don't want to fact criticism for living a polyamorous lifestyle. If social acceptance is a valid basis for same-sex marriage, it is an equally-valid basis for marriage of three or more.
The plaintiffs have described the history of discrimination against gays and lesbians. One expert testified that "lesbians and gay men have experienced widespread and acute discrimination." Similarly, polyamorous families can actually lose custody of their children simply because there are more than two adults in the household. Like same-sex couples, polyamorists fear "legal penalties, professional penalties, and the emotional penalty of shame and blame" for their lifestyles. If rectifying discrimination is a basis for same-sex marriage, it is also a basis for marriage of three or more.
I challenge anyone who reads these words to do one simple task: State an argument for same-sex marriage that doesn't also justify polyamorous marriage. You will find that it's not simple task at all.