there are ways to handle this, even altering your own photos. This can be done subtly to throw off image searching programs without looking different to a human eye even. Stealing someone else's photos and misrepresenting yourself is a lie and unacceptable in my book.
Also know that no matter what you do, if you do this type of work, you are taking on risk about creepy guys. The internet is full of them. Already in this thread, someone posted her actual identity, assuming it was actually correct (which has now been edited out, but probably hundreds of guys saw the name).