Definately. I don't want to do things with co workers outside of work (or in work) for similar reasons. And frankly I wish I could avoid them coming near me at all. Today a friend came into my office and wanted me to look at a bone spurr type of thing on her shoulder. TO do so she took down her spaghetti strap on her arm... I literally was standing like 10 feet away and she kept being like "what is it... "

Just what I need for someone to walk in while she has her spaghetti strap down...

But you are absolutely right to be this way. My parents taught me well. I have always been on guard when it comes to that.

Don't ever let people sucker you into being friendly. That is just a good way to end up used and abused. Keep it professional and have a rolodex of excuses why you can't go to events outside of work.