How To Indicate That You Don't Want A Man To Approach You

How can I indicate I don't want a man to approach me?

Let's say you see a guy checking you out but you are definitely not interested. Turn your body away - body language is important - and don't make eye contact again. If you're interested in meeting other men that night, you'll have to keep your eye out and make sure you're not shutting out the rest of the world when you're just shutting out this one guy.