This is a wierd quirk I notice in myself... even when completely alone (and I'm very comfortable with my body!) I have to be upright or leaning forward in order to be fully aroused.

Like, no lying on my back. To masturbate, I sit up or kneel. Lying on my front, or on all fours is good too. But even when I get really horny and I'm close to orgasm, if I lie back onto my back, the arousal literally disappears!

Anybody else notice that they have fovorite positions... or positions that just don't do anything for you at all?