Termites' nests are frequently invaded by other animals. Some of these intruders, referred to as obligatory termitophiles, are obliged to spend at least one phase of their development in the termitarium. The staphylinid beetle \textit{Corotoca melantho} is an obligatory termitophile cohabitant of the termite species \textit{Constrictotermes cyphergaster}. Females of \textit{Corotoca melantho} are viviparous and when found in the termitarium they are pregnant. It is also known that this termitophile spends the adult life in the termitarium. However, there is no record of juveniles in the termites nest. Why are there only adult beetles in the termitarium? In order to find an answer to this question, we hypothesised that the termitarium is linked to the sexual needs of this termitophile by facilitating reproduction. We inspected the reproductive tract of both males and females, searching for any clue that could support our hypothesis. Inspection of the morpho-anatomical reproductive traits of \textit{C. melantho} revealed a gradient of growth stages of embryos and larvae in females oviduct with asynchronous development of oocytes. The absence of spermatheca in females demands frequent mating. Mating is eased by the existence, in males testes, of a full developing sequence of germ cells, indicating continuous spermatogenesis. The results of our study shows that there is a strong alignment between the reproductive needs of \textit{C. melantho} beetle and the physical structure of their hosting termitarium, since in addition to protecting the pregnant females, an enclosed environment increase the probability of encounters and mating. Funding: Capes, Fapemig.