Multiple internal sperm

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It is difficult to predict a priori how mating success translates into fertilization success in simultaneous hermaphrodites with internal fertilization. Whereas insemination decisions will be determined by male interests, fertilization will depend on female interests, possibly leading to discrepancies between insemination and fertilization patterns. The planarian flatworm Schmidtea polychroa, a simultaneous hermaphrodite in which mating partners trade sperm was studied. Sperm can be stored for months yet individuals mate frequently. Using microsatellites, maternity and paternity data were obtained from offspring produced in six groups of 10 individuals during four weeks.
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Female sperm storage

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Fertilization | Biology I

NCBI Bookshelf. Molecular Biology of the Cell. New York: Garland Science; Once released, egg and sperm alike are destined to die within minutes or hours unless they find each other and fuse in the process of fertilization.
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Male Reproductive System

Reproduction is the process by which organisms make more organisms like themselves. But even though the reproductive system is essential to keeping a species alive, unlike other body systems, it's not essential to keeping an individual alive. In the human reproductive process, two kinds of sex cells, or gametes pronounced: GAH-meetz , are involved.
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Sexual reproduction starts with the combination of a sperm and an egg in a process called fertilization. This can occur either inside internal fertilization or outside external fertilization the body of the female. Humans provide an example of the former whereas seahorse reproduction is an example of the latter.
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