watersnipje
Two of my exes were significantly shorter than me, and I think at least half of them were my height or shorter. I don’t give a fuck, height is such an unimportant and arbitrary characteristic. I don’t know many women who care about it.
But I guess if you’re looking for shallow contact, you’ll find shallow people.
Here’s some review of recent research on the topic: https://pmc.ncbi.nlm.nih.gov/articles/PMC6970937/
Any chance you could fish it out and take a picture for identification?
Strange. Do I understand correctly that this toilet is not on the ground floor? It’s hard to tell, but it almost looks like an earth worm to me. In that case, I would expect something like a crack in the sewer line, but I’m not sure how that would work if it’s on a higher floor.
Do you have pets or kids who could have brought it in somehow?
I’m not a expert on invertebrates but it doesn’t look parasitic to me. If it’s not on the ground floor, then yeah, maybe a bird or other critter (rat? Stone marten?) dragged it in?
As for the “it came from the sewers” options - have you had any very heavy rain recently?
[edit] I’ve searched around a bit, because I was curious, and it seems that finding earth worms in toilets in really not uncommon at all. You might want to get your sewer pipes checked though, see if there are any cracks.