You have to hand it to spiders, they're so crafty, building their fancy webs and always managing to crawl out of your shoe and spook you just when you're least expecting it. But there is one kind of spider that has really gone above and beyond the call of duty: The orb-web spider, ephilengys malabarensis, has a detachable penis—actually it has two of them.

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The spiders are sexually cannibalistic, so the ability to walk away mid-coitus is actually a real life saver. The palps detach from their bodies either because they scurry away in hopes of not being eaten or because the lady spider pushes them off (and then possibly eats them).
There are also some serious drawbacks to this set-up. Having only two palps means each spider has just two chances to mate in their entire lives—if they're lucky. Not very good odds.
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