The mating season is the period during which members of the normally sexually inactive Race reproduce. Females become fertile once a year (as measured on Home; twice a year by Tosev 3's standards) and emit pheromones which create overwhelming degrees of arousal in males. In the absence of these pheromones males cannot be aroused. Males attempt to mate with females wherever they find them, in public places or even in the middle of the street. Sometimes males engage in (occasionally fatal) combat over females, but often males are willing to take turns. There is no desire for exclusivity on the part of either gender, just that the female be coupled with and the male get his fair chance to do the coupling (although the Emperor maintains a private harem to ensure the purity of the Ssumaz dynasty's line). It is a very chaotic period in the Race's life.

Females who become gravid allow their eggs to gestate within their bodies for several weeks, then find a suitable nesting area, lay their eggs, and abandon them. Any hatchling who emerges from its egg will receive no parental care from either parent.

Similar mating behaviors are seen among the Rabotevs, the Hallessi, and most animals native to all three of the Empire's planets.

When the Colonization Fleet brought females to Tosev 3, it was found that ginger caused females to become fertile and emit pheromones (thus arousing males) at all times. Constant sexual arousal was a distraction with which the Race was not biologically equipped to deal, and in some cases social patterns were profoundly altered. Some Lizards defected to the Tosevite not-empires and entered into exclusive mating arrangements modeled on human marriage. The mainstream culture of the Race considered these individuals perverts and ostracized them. There also appeared the phenomenon of prostitution, hitherto completely unknown in the Race's society, with some females ready to take ginger in return for payment.

The Race, having no concept that sex should be a private act, caused a highly embarrassing moment for Jonathan Yeager, when Ttomalss causally walked in on him and Kassquit having sex. Despite all the years that Ttomalss had spent studying Tosevite behavior, he failed to grasp that Tosevites found such an act unacceptable.

See also Inconsistencies in Turtledove's Work#Inconsistencies in Worldwar

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