: Research into these arachnids details aggressive mating rituals where males use specific legs to grab and "shake" females by their sensory legs. Fossil evidence has even identified a 99-million-year-old male daddy longlegs trapped in amber while fully aroused.

Research in evolutionary psychology has examined how leg length relative to a person's height (Leg-to-Body Ratio or LBR) serves as a criterion for physical attractiveness.

Several biological "full papers" discuss the evolutionary role of leg size and function during reproduction in various species:

: Studies on Drosophila prolongata show that males have evolved dramatically larger forelegs compared to females. These legs are used for "male-male grappling" and a unique courtship behavior called leg vibration to signal to females during mating rituals.

: Academic research has documented significant sex differences in RLS, finding that women are twice as likely to be affected as men, with parity (number of children) being a major contributing factor.

: Papers on these water striders describe how sexual selection has led to exaggerated, sex-biased leg sizes, where male leg length is a primary secondary sexual trait. 3. Medical and Health-Related Studies

: In contrast, the same study indicated that men were perceived as more attractive when they had a shorter LBR. 2. Biology and Mating Rituals in Nature

: A full study published in Evolution and Human Behavior found that British undergraduates rated women with a longer LBR as more attractive. Longer legs in women are often theorized to be a signal of health and reproductive fitness.