It's not so much the content as the presentation. The tone is incredibly self-absorbed and condescending. I thought the whole thing was a joke until I encountered the above quoted paragraph with its apparent sincerity. Presumably some of the content is intended to be tongue-in-check and some of it posturing, but it's difficult to separate. There's a compounding weirdness to the whole thing. Fetishes or open relationships or whatever aren't in themselves causes for concern but when somebody is trying to advocate for rationalism and a particular approach to ethics, the sense that you're following them somewhere very strange isn't good to have.

Let me try to make that clearer: Utilitarianism already has the problem of frequently sounding as if sociopaths are discussing ethics as something entirely abstract. Applying that to relationships, in the form of evangelical polyamory, takes it to another level of squeamishness (as others here have indicated). Seeing those ideas put into practice in the context of the dating profile of a self-professed sadist (who has been accused of wanting to take over the world, no less), replete with technical terminology ("primary", "dance card", etc), condescending advice to prospective conquests to help them overcome their fear of rejection and a general tone of callousness, sends it over the edge. Read straight, the profile could almost serve as a reductio for SIAI-brand ethics and rationality.

I'm also worried about who the intended audience is. Since I can't imagine anyone not deeply immersed in the Less Wrong community responding positively to it, I was left with the sense that perhaps our community's figurehead is (ab)using his position in ways that, as some else put it, "don't help the phyg pattern matching." It's basically an advertisement saying, "I'm a leader in small community x and I'm open to your sexual advances, so don't be shy."