I don't know if those pics are generally known but, as I found them on a bondage related site, I just wanted to share them.
http://www.angelfire.com/bug/gy4/tick.jpg
http://www.angelfire.com/bug/gy4/tick2.jpg
http://www.angelfire.com/bug/gy4/tick.jpg
http://www.angelfire.com/bug/gy4/tick2.jpg