Most (in fact, all) amphibians have internal reproductive organs which extend outwards during mating. This may be why there is no apparent difference between male/female Gabbits. Also, since Latimare (Munch) is apparently naked, I think it was wise to keep those things hidden. Like, when cartoon peoples who don't wear pants appear on screen, we don't see any dangly parts.
IT's FO THA KIDS!
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