Happy Valentine's Day!

That's a wild read. It's baffling how such an organism can evolve with such a particular way of living.

In true valentine's day fashion it goes through the heart.

I'll never go swimming in Africa or south America now.

Oh no. No no no no no. I stopped having nightmares about this little fucker years ago. You can't make me go back!!

Permanently

A previous post mentioned flatworms "penis fencing" to determine who impregnates whom, so I assume this is a post-fencing copulation session.