#16 - Huge turn-off. Especially black socks. It won't be happening with me if there are socks.
Normally I'd agree, but it can depend on the circumstances.
I remember one time when my partner and I were waiting for a mutual friend to meet us at her place (I think the three of us were going out together, but I don't recall where). Signals got a bit crossed between the two of us: I'd been wanting to have sex but apparently she hadn't realized it. I, meanwhile, thought she wasn't all that interested right then.
When I finally just came out and asked her, we had very little time left before our friend was supposed to show up. It turned into the quickest of quickies: She left her socks on; I never removed my watch; I entered her so quickly that I saw her wince.
We both enjoyed it.