I support your right to marry who you want, if you support my right to be a slut.
Just my opinion, but I don't think you can have one without the other. Creating a hierarchy of relationships is counter productive to what we are fighting for - the freedom to love and the recognition of that freedom. It sets up a negative 'us and them' mentality - the very thing that we are fighting against. And despite subjective moral attitudes on the subject, there is little to suggest that either choice cannot produce meaningful interactions. Sex is normal. It's so fundamentally human. We all come into this world as a result of it in some form. We all do it, or at least we should be. And we should be talking about it respectfully without fear of degradation.