Are two penises better than one? Not so, implies a study of doubly endowed earwigs. An ancestral behavioural preference for the right penis might have facilitated the loss of the left in species that arose later.
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Palmer, A. Caught right-handed. Nature 444, 689–692 (2006). https://doi.org/10.1038/444689a
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DOI: https://doi.org/10.1038/444689a
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