I have to share this with those that haven't tried it yet, but a little
sillicon penis ring has changed my life.  I noticed that when my penis gets
grabbed at the base and pulled back, even semi-erect, the blood really fills
it up to rock hard. The problem was that as soon as released, it often
deflates again and becomes unuseable. Well this little ring works so well
that I don't need vitamin V anymore! It's not uncomfortable at all, and when
done it slips off with soapy water.  My wife is latex allergic, so you guys
can use the latex ones which are much easier to find.  At a few bucks, it's
infinitely reuseable, and my dependence on meds is greatly reduced.