Tattoo, let me just say "I-can-relate". My wife and I just got out of our tub (read, "yes-no leakage-thanks Bill!) and I know what you mean. My property is boarded by 3 neighbors. One of which, if he so desired would be able to look down into our tub from his slightly elevated lot.
I have taken great pains in being sure that said neighbor; desire to cast his glance our way; have a rather tough time of seeing anything. Light was the magic answer. I removed all light from our fenced hot water haven. Now, should said neighbor posses a awesome set of night vision goggles then I would step a side. Plus the fact tha when he is home it is rather obvious as every and anything that lights up is illuminated!