I, must say that I, too, am very interested as to the answer of this question, since it is a label that certain people have attached to me, and it surprised me. My conclusion was that their definition was quite possibly different to mine.
I would like to know what behaviors are considered "sex-negative" so that I can look in the mirror and see whether they fit me or not. On the flip-side, I would like to know what actions are considered to be "sex-positive".
I wouldn't like anybody (and I do mean anybody) to stop contributing to this forum just because opinions differ.
"Listen, or your tongue will make you deaf." - Native American Proverb