Hello, I am 52 years of age and am having difficulty achieving an erection, so I guess you could say I have "ED". I have been prescribed Viagra, but being that it is so expensive I cannot always afford it, so I have to try my best at times without it. I can often ejaculate, producing sperm, however it is without an erection, which makes intercourse difficult, if not impossible. My question is, how can one ejaculate without an erection, and why?