I think the standout would be number 2. Its got a touch of naughtiness that everyone loves. And I think it'd make a nice hook for a song.
Particularly a song about Herpes :p
Agree that 'it's' should be cut from the title. Reads better like that,
But personally, the one that intrigues me the most would be little lights. Just because I don't know what it could possibly mean just by the title. It's far too weird if taken literally, so you must intend to use it in some clever way. So many possibilities exist for that title, you know?
The rest, number 2 included, I already assume what the song is about, just by virtue of it being possible to be taken literally. For instance, number 1, I'd assume was about being there for someone, or running away together. Number 2 would be something sexual. Number 3 would be an old man needing to pee in the middle of the night. I may not be wrong, but some of the mysticism is lost.