Thinking of You is a song by the modern-rock group A Perfect Circle. It is track 10 of their debut album Mer de Noms and lasts approximately 4 minutes and 31 seconds.
The theme of the song is anal sex. Anybody familiar with Maynard James Keenan and Tool knows that this is a concept that is woven into his lyrics quite often, whether it is literal or metaphoric. To dispute the validity of opposing claims here on E2 as to the meaning of the song, I have seen and heard Maynard proclaim in concert the "true" meaning of the song (though again, those familiar, know the meaning of those quotations).
In addition to this overall theme, the song has references to male masturbation and the enjoyment of the forbidden and taboo, which only seem to add validity to this meaning.
Lyrics can be found on APC's official website at http://www.aperfectcircle.com/lyrics.php
Ahh, sweet surrender...