Preferred Relationship Tuples through the Decades

Decade	Preferred Relationship Tuple
1890's	nulltuple (=Victorian Era, absolute desireless purity)
1940s-1950s	single or couple
1960's	triple (=oneself + main squeeze + minor squeeze)
1970's	quadruple++ (=couples at key parties, cf. The Ice Storm, group sex cf. Caligula)
1980-1990's	couple (age of AIDS, therefore “monogamous”)
2000-2010-s	single (=maritally separated or divorced, in search of e.g. SWF, etc.)
2015-?	zerogle (=#Metoo, avoiding legal hassles, ogling optionally)