Speed and GHB, especially when combined. When done alone speed is more likely to actually make interested in sex while GHB tends to at first just makes me more affectionate, but with the right people.. then there is alcohol, which is like a sloppy version of what GHB does to intimacy. For some reason on 4-aco-dmt (a very high dose, somwhere in between 50 and 100 mg snorted) made me want the person I'm with; in a very deep and trippy way, which was by the way way more intense then the lust increase that for example GHB gives; only it does not occur every trip or even that often, but when psychedelics and love / lust come together then: awesome shit. Sometimes I randomly get affectionate on ketamine, which is rather odd, to be into something physical when so detached from the body; not sure how that works really.