Factoids about animal reproduction
These little slugs are TINY. Like just a few mm long. 
I am not clear on why the penises corkscrew in the first place tho. Maybe it helps them evert (inflate) faster? 
Echidnas are like hedgehogs if they were marsupials instead of… whatever hedgehogs are. 
I did my best to draw this honey bee penis, but honestly I have no idea how well I did. 
This is my favorite penis fact, by far. Such a cute little slug mucus cuddle. 
They do have long proboscises, tho. 
There is an amazing video of this- the link is in the references. It just pops out like a jack-in-the-box! 
SO MANY SPINES! 
Not saying human copulation is short, but… there’s no bone in your boner, friend. 
There is a LOT of debate about why genital structures are so varied among species. SO MUCH DRAMA. 
I’m guessing they pheromones to find their mates, but I like to imagine a large rock covered in barnacles, little penises emerging from all of them, feeling around like long thin little fingers. 
What I want to know is if this makes them swim around in circles. 
Shark sex is BRUTAL. Also, now you know sharks, skates, and rays have external genitalia, you can go to an aquarium and correct people whenever they misgender the fish. It’s a lot of fun! Probably why no one ever wants to go to an aquarium with me twice, because they can’t imagine having so much fun a second time. 
I drew this, but still am not sure what is happening here. 
I recommend watching some youtube videos about this, because those penises are out there, waving around like giant snakes. 
Most flatworms are a little more chill about mating. 
I found conflicting diagrams, both from published books, on whether the fertilizing clasper is anterior or posterior to the spiny knob clasper. It might vary between species. 
I’ve gotten conflicting info on whether or not the males desiccate only leaving their gonads behind or whether they actually thrive better than free-living males. 
This is the grossest penis I have yet drawn. 
So many limbs, so little anything else 
Still a better love story than Twilight. 
‘Give it to me’ has a new meaning 
This would be the good beginning of a cheesy horror movie about a women giving birth to hundreds of squid babies. 
‘No hemipene necessary’ 
birdoptera 