Abstinons : Male-produced deterrents of mating in flies.

Glossina morsitans morsitans Westwood andMusca domestica Linne have an efficient strategy for preventing wasteful homosexual activity in males: hexane-soluble substances on the cuticle of the male flies terminate courting by other males on contact. The inhibitory activity of these materials is demonstrated by the abstention of males from mating with females treated with male extract.