This is awkward to put on and remove, but as long as somebody’s trying to sell it for DM 298 (~$US 160)(www.penisplus.com.), you might as well know about it.

You can also do it with just an Ace bandage: In either case, you need to tie a taut line hitch - a knot that will serve you in many other ways (great for tying down loads on cars, for example). Here’s a diagram(thank you, Boy Scouts!):