Complex sentence: Engaging in lordosis behavior--a physical posture seen in many female mammals, often when they are ready for sex/mating, the primary characteristic of which is a ventral arching of the spine--is considered by some people to be erotic or sexually provocative.
Split into simpler sentences: Engaging in lordosis behavior--a physical posture seen in many female mammals, often when they are ready for sex/mating, the primary characteristic of which is a ventral arching of the spine. The position is considered by some people to be erotic or sexually provocative.