Thanks, Cannabis. I knew it because I'd read about the mechanism of erection some years ago in one of my husband's cardiology magazines, Circulation, when Viagra was just about to make its debut on the market. That was a big scientific discovery--the connection between relaxation of the vasculature and erection. For a long time before that, urologists and circulatory doctors thought it had to do with the ability of the veins and arteries to maintain tension rather than to relax. That's why all the medications they developed before the light bulb went on about vaso-dilation didn't work worth a darn. That's why before Viagra, the most reliable erection aid was a surgically implanted inflatable device.

I've been a frustrated doctor for a long time and have always read a lot about medicine, and I've always retained it easily because it interested me so much. On August 14, I'll be starting medical school myself so I can make it official.