ID please..and should I cover my eyes?

I don't even know what these things are. I have a bunch of them in all my tanks. These two are in the planted tank. I rarely if ever see them in the daytime, but apparently they had a specific reason for coming out today. I'm not sure, but it looks like baby making behavior to me.

So can anyone tell me what they are and if this is indeed baby making behavior? They don't have a shell like snail, but have a blackish "hull" thing on their backs.

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They seem to be the shape of a nudibranch rather than a stomatella. We need to see them from the opposite side.
 
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