I think there are more people interested in or wired for swinging than poly, and now that more awareness is arising about poly, they are probably simply eager to talk to other non-monogamous folks. They might not be aware of the amount of variety in the non-mono world, or that swinging might work better for them, for instance.
A lot of the advice stays pertinent, I believe, and I like the idea of being inclusive, so I don't have a problem with a lot of threads about sex, but I can understand that you don't relate much to them. That's okay, other people will, as poly and swinging are not mutually exclusive. I usually simply avoid giving advice if I really have nothing to say.