Playing

Masturbating in your room by yourself is one thing. Masturbating in front of a webcam to a person you hardly know through MSN while he might be wanking away while watching you is another thing.

When you play, you really just play. No emotions involved.
If you are going to get your body involved, you had better be open-minded. If your family and friends aren't that sort, you'd better keep your actions to yourself.

If you can't take that risk, then don't do it.

But sometimes desire mess with rational thinking.