noun, feminine/lɛvʁ ɛk.stɛʁn/
lèvres externes is feminine in French.
labia majora
“Pendant l'excitation sexuelle, les lèvres externes gonflent en raison de l'augmentation du flux sanguin vers la région et reculent, ouvrant légèrement la vulve.” — During sexual arousal, the labia majora become engorged because of the increased blood flow to the region, and spread apart, opening the vulva slightly.
Synonyms: grandes lèvres