Desire, in this context, is a force of attraction in the wrong direction: we long for it, crave it, covet it, and want it. That sounds like a good description of what happens to a single that is getting interested in someone of the opposite sex. Desire is something that can be nourished or stifled. We can control and even eliminate it, if we deal with it immediately.
Be genuine. Don't pretend to be someone you aren't - girls will be able to see right through it. There's nothing wrong with reading up on a band you know a girl likes so you can have a conversation about it later, but don't pretend you know how to play the guitar unless you're prepared to play her a song at a moment's notice. Be real, and you won't have to lie.
Dating as an institution is a relatively recent phenomenon which has mainly emerged in the last few centuries. From the standpoint of anthropology and sociology, dating is linked with other institutions such as marriage and the family which have also been changing rapidly and which have been subject to many forces, including advances in technology and medicine. As humans societies have evolved from hunter-gatherers into civilized societies, there have been substantial changes in relations between people, with perhaps one of a few remaining biological constants being that both adult women and men must have sexual intercourse for human procreation to happen.