What? I don't think this is sx-last. There's a lot of intensity in these, in the form of of intense colors or contrast (often to the point of being basically chiaroscuro), and some of the subject matter seems to have a sort of violent subtext to me. I think it's probably SP/SX or SX/SP. This kind of imagery and colors really reminds me of raves and things like that, where everyone is grinding against each other and waving flashing lights and doing various drugs, but significantly more introverted than what I think of that generally. A lot of it is strongly pop-art-ish as well.