Infernal Triangle
from Fancyclopedia 2 ca. 1959
The pulpcover trinity of bum-babe-BEM, notably as appearing on the covers of Bergey-illustrated Standard Twins. Also practically any 3-fan group, especially the WO3W and Wheels of IF.

from Fancyclopedia 2 Supplement ca. 1960:
Some write the abbreviation BEM-FEM-LEM, the last standing for Lascivious-Eyed Male — although in point of fact most of the heroes in this sort of cover were either clear-eyed and nobel or squinty-eyed and ferocious-looking. But it makes a passable rhyme.