Cassie - wanting the odd experience of 'the other' is normal. probably near 100% of thinking sexual activists (like Pixies people) have at least thought about it. So don't worry about it.

On the other question - how do I know when a woman is open to sexual suggestions - well, baby, allow me to gloat! Join the club! Men have spent a life itme trying figure out just that, and still get it wrong most of the time. I know I do. You will find that your potential targets hold all the cards, and life is tough out there. If you find a foolproof answer, please let me know before anyone else.....