very rude HNT

Last year I posted pictures of my albino tattooed friend in the garden. I wondered why he had a tattoo on his back.




Then last week I noticed he had found a friend with exactly the same tattoo, so it must be part of the species' genetic makeup. But what could be the point of it?




I took the HNT picture above, and loaded it on the computer. On zooming in, it became clear that they were being more than just friendly:




I think slugs must be bisexual. Or do I mean hermaphrodite? Whatever, as you can see, these two had their holes open and their thingies out (possibly not the correct biological terms).

At last, I have a theory about why they have big triangular tattoos on the back. You'll notice one corner of the triangle coincides with the hole. So maybe it's to guide the other slug's willie into the right area, like runway landing lights on an airstrip.

What do you think?

I grabbed the video camera and rushed back outside to film them for upload to slugtube. But they had disappeared! Those slugs move fast.

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