Lyric discussion by rog27 

Everyone is certainly entitle to their own opinions. But from a brief literary analysis, this song seems to be heavy on double-entendre and metaphor.

It seems to be from the perspective of a disillusioned guy in an unhealthy relationship. He's been taken advantage of emotionally. The girl he's with leverages sex to get what she wants, and she doesn't seem to be faithful at all. This guy knows she's not faithful, but writes off all of her affairs as just physical, methodical, and simply as a fix -- comparing her to a nurse administering "drugs" to her patients (professional almost with no emotional ties). He believes he's the only one she truly loves. We all know that she's pulling one over his eyes, though.

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