Male avoidance of parasitized females explained by direct benefits in a pipefish. Call duration as an indicator of genetic quality in male gray tree frogs. Wilkinson, G. S., D. C. Presgraves, and L. Crymes. Male eye span in stalk-eyed flies indicates genetic quality by meiotic drive suppression. Moller, A. P. 1992.
Females prefer large and symmetrical ornaments.
Thornhill, R. 1992. Fluctuating asymmetry and the mating system of the Japanese scorpionfly, Panorpa japonica . Watson, P. J. and R. Thornhill. Fluctuating asymmetry and sexual selection. Female preference predates the evolution of the sword in swordtail fish.