bimetallism, n. — Green’s Dictionary of Slang

bimetallism n.

[play on SE bimetallism, ‘a system of allowing the unrestricted currency of two metals (e.g. gold and silver) as legal tender at a fixed ratio to each other’ (Oxford Languages)]

bisexuality, thus n. bimetallist.

1910		[A. Crowley] Scented Garden of Abdullah 25: Now this question of Bimetallism leads us to the subject of the reason for our indulgence, since we are not [...] the slaves of an uncontrollable paranoia [Simes:DLSS].
1910		[A. Crowley] Scented Garden of Abdullah 24: [L]et me further make a distinction between the two great classes of sodomites [...] for the former we have no colloquial name: the latter we term Bimetallist [Simes:DLSS].
1943		E.T. Backhouse Décadence mandchoue (2011) 115: I have good ground for belief that his tastes inclined (no less than mine own) toward (what we will euphemistically denominate) ‘bi-metallism’ [Simes:DLSS].
1985		W. Dynes Homolexis 21: [B]isexuality has inspired a number of jocular sobriquets: bimetallism [Simes:DLSS].