Does it appear under "My Photo Stream" or does it have another name? Anyone can share photos using your Apple ID email. This does not mean they have access to your email or Apple ID. If they are appearing in your Photo Stream, change your password: http://iforgot.apple.com.
Thank you for the quick reply. Yes, it is in my photo stream. I will change my password then. Any idea how this could happen? Maybe I am being paranoid, but the pictures are all of young men on the streets of Middle Eastern countries - I can tell this by street signs in the backgrounds of the photos. No reason these types of photos should end up on a suburban mom's phone?? Thanks again for the advice.