This song is about deciding to have sex with your partner. The line, "Just get dressed don't do this," is telling her they don't need to have sex; she should give him a chance to have a relationship without sex at the beginning. The line, "Are you positive?" could be asking, "Are you sure you want to do this?" or asking if she's been tested.
"Number five, with a bullet" is a line from the movie High Fidelity. John Cusack's character, Rob, almost obsessively does top 5 lists, and starts the film with his top five breakups in chronological order. As he goes through the film, he explains how the breakups happened, and reveals that the girl in his number 5 slot he put there to keep his most recent breakup, Laura, out of the top five. But Laura is seeing a man Rob hates, and enters the number five slot, "with a bullet."
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