Musculus females perform assortative mate choice.

Male mount attempts, female rejection behavior, mounts, and ejaculations are presented in average (Mean ± SE) and for individual females (N♀ and percentage).*indicates that one out of four females received 2 ejaculations from the musculus male during the one hour test. P values of Wilcoxon test comparing musculus and domesticus means are also presented (Mus, musculus; Dom, domesticus; NS, not significant).