You guys are missing the point. The point in treating a woman like a buddy is not in being desireless, but in comfort. In being cool, calm, laidback. When you call up a buddy, is you and your voice nervous? No, no need to. When you're hanging out, you are completely in "the zone" and you do whatever without fear of consequences. You don't try too hard either, your "you" just flows. Everything comes off naturally, because you're being natural.
THAT is the point in treating a woman like a buddy.
Still embrace your sexual desires. She knows you want to fvck her, there's no point in hiding it. Chris Rock once remarked guys go on first dates wondering if he's going to get laid, women go on first dates already knowing.
Control your sexuality by not letting it get the best of you (nervousness, boneheaded remarks, etc). Control yourself. Comfort with yourself.
Pretending to be desireless around hot chicks doesn't actually work. I had noticed girls were much more comfortable around me, I was having "success", but in the end I realized it was all a sham, for all I was doing was sanitizing myself; it didn't make them more interested in me, they weren't, I was just coming off as safer.