The Spanish verb 'culiar' (to have sex) traces its origins to the Latin word 'culus' meaning 'buttocks'. This evolved into the Spanish noun 'culo' (buttocks), which then gave rise to the verb 'culear' (to move the buttocks). Finally, 'culear' developed into 'culiar' with its current meaning through semantic extension.

Some simpler, related Spanish words include 'culo' (buttocks) and the verb 'culear' (to move the buttocks). These words share the same Latin root and maintain meanings more directly connected to the original anatomical sense.

While there aren't many common English cognates derived from Latin 'culus', some technical anatomical terms like 'culottes' (a type of split skirt) entered English via French, ultimately tracing back to the same Latin root.