A stingray's sex can be determined fairly easily based on the presence or absence of claspers, two "penises" connected to the inside of the pelvic fins of male rays. They are usually about the size of your pinky finger on mature specimens and are rolled up into hollow tubes.
So those are penises…
http://www.raylady.com/Potamotrygon/Physiology.html
Wow I was going to comment on how their legs look they have boners but uh... never mind I guess.
Why do they have two of them?
You don't?
Why not?
What you mean 2, everybody has 2.
My penis is often mistaken for a leg too.
Yeah but two legs?