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mdni; mostly sfw 21 / US / fujoshi scientist / gay and cant draw if i block u its nothin personal
mdni; mostly sfw 21 / US / fujoshi scientist / gay and cant draw if i block u its nothin personal
![• Turbellaria (free living flatworms) -
Hermaphroditic flatworms reproduce by "penis fencing". Individuals "fence" with penises, attempting to use their penis to pierce the skin of the other and inject sperm. The 'loser' is the flatworm which is inseminated and must bear
the energy costs of reproduction. One study of Pseudoceros bifurcus found "Most inseminations were unilateral. Even when reciprocal penis insertion could be achieved by the second partner, the first to inseminate obtained a longer injection time than the second."[24][25] In another species,
Macrostomum hystrix, the worm may also inject its sperm into its own head if other mates are not available. 26]](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:b4z65u3xeqgvghmg4koidrqf/bafkreieigdrk5x4wt6pn6uv5kfgphn7mknnjexendcsjewds43xeomhsim)
