re: viagra ads with the warning about 4 hour erections. Prior to those pills becoming available, I had never ever heard about 4 hour erections being dangerous. I had heard about priapism which is more or pess a permanent erection being a problem. I *suspect* that this 4 hour business is more of a marketing device invented by the viagra folks to mke people talk, as well as give the idea that viagra may give you "dangerously long erections". And it has worked because the mere mention of "4 hours" bring to mind 4 hour erections and viagra. And there are plenty of jokes about the "4 hours". So their marketing has been quite succesful in getting into the mainstream. In my case, I can edge for many many hours, but during those hours, I will switch from erect to flaccid to erect a number of times. (aka: not a continuous 4 hour erection, but rather staying erect for 4 hours with some flaccid moments in there). I also notice that for extra long foreplay (such as chatting for hours on-line without orgasm), the skin on the penis tends to darken. After final masturbation with orgasm, the penis returns no normal colour by the time I wake up.