SEE! Leashes...
and the 3rd link in Google
http://www.stockroom.com/The-7-Gates-of-Hell-P344.aspx (you gotta copy & paste if you NEED to see a more explicit pic) says "This device, named in keeping with long standing tradition, is used for male constraint and adornment."....so it is more a psychological toy than a useful one.

We actually didn't sell many...there were 'specialty shops' down in Wash DC that got most of that business.