Be more aware of your surroundings? If it's a real problem, then become paranoid. It might protect you somewhat. >_>

It would suck to have a loved-one photographed in the locker room or something. However, that's just one of those things you need to learn to laugh off. People's friends photograph them shit-faced drunk, doing the most horrible and embarassing things ever (so glad I don't drink :p) and those photos often end up rather public. If someone is photographing me through my house window, that's another thing - an invasion of privacy (which has been stated in this thread already).

Random. Where would those old-school P.I.'s be? x3