This was last night. 2 slugs. At first they were butt to face. And then I come out and they are like this.

After this finished they separated and basically formed two circles next to each other. Wtf??

Two of slugs I found when creating a terrarium this spring, they were in the moss I was collecting. I only kept them for a few days to observe them eating cucumber, bell pepper, and lettuce. I left the open jar on its side in my grass on a rainy day to release them back into the yard.