There’s no aphrodisiac quite like Loneliness, especially if you live in Sydney and you’re lonely for someone who’s in Melbourne. (I suppose the reverse is also true.)
Oh sure, there are all sorts of other things that complicate it, like truth, beauty, pictures of the one you’re missing, boredom, and so on, and so on, but at the end of the day (or more accurately, the night) it’s just Loneliness, making the heart grow fonder and the groin go yonder.