This only occurred to me a few weeks ago, and it is odd. I hate being touched by things, in water, that I can't see.
For example, I cannot go swimming in a yucky lake or at a NY beach. I am too freaked-out by the fact that there could be things under the icky green water that I can't see. I have gone snorkeling in the Caribbean, and I've been in the midst of schools of tiny fish brushing against me as they swim past. That's no problem, because I can see them.
Perhaps even more odd, though, is that I think this leads to my utter loathing of doing the dishes. I knew I hated doing the dishes, but I wasn't sure why. I think I figured it out; I don't like putting my hands in the sudsy dishwater because I can't see what's in there. A few weeks ago, I decided to test this theory, and I bought myself rubber dish gloves. No problem doing the dishes now.
As for baths, I know there's nothing in there with me, so I'm pretty relaxed. But you can bet that if I feel anything touch me, like a hair, I will jump out of the tub.
Yeah, pretty odd.