During copulation, sperm is transferred from male to female inside a spermatophore. During copulation, a male transfers his spermatophore to a female. Mating involves direct copulation, rather than the deposition of a spermatophore. Accessory glands secrete fluids that comprise the spermatophore. Males court females with a ritualised display and deposit a spermatophore. An increase in spermatophore size increases the fecundity of female monarchs. This gland produces the spermatophore, which carries a sperm packet at its tip. They have gonads that contain the ovary and spermatophore bunches in their gastrodermis. In most species, the male transfers sperm to the female in a package, or spermatophore. In males, production of the spermatophore, sperm, and secondary chemicals reduces their lifespan. Courtship rituals and methods of transfer of the spermatophore vary between species. During mating, males first deliver a volume of seminal compounds followed by the spermatophore. With each successive mating, the volume of the spermatophore decreases. This is used for depositing a spermatophore inside the mantle cavity of a female. Stimulation of spermatophore deposition by female pheromones has been demonstrated in "Sinella curviseta".