Seeing as you didn't have a whole body button I voted for neck. That is because I think the back of a woman's neck, just below the hairline is very erotic, especially if there are a few wisps of fine hair curling like tendrils over the skin. The best thing is that women rarely cover their necks so there are lots out there to see on a daily basis.

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Strength in depth

I believe your most attractive features are your heart and soul