Zig_Fighter: Sharks have two small fin-like extensions called claspers, of which on is used to deliver sperm. Not only that, but on Requiem sharks (and many other types) they're much further down, close to the tail.
Anonymous7: While we're dissecting the science behind weird porn, it's always bothered me that mermaids are shown with breasts in virtually every incarnation. Why would they need breasts? IT JUST DOESN'T MAKE SENSE. And if they were technically underwater mammals... that just raises even more questions.
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/oceanfag
STOP ALL THE DOWNLOADING!
...wait, what?
"What's the best tuna?"