Luke, out of curiosity, have you had a semen analysis done? The likelyhood is that if you do have a decreased volume (I can't infer whether or not that's what you stated in your question) you actually have no sperm in your ejaculate-or any other men with CF for that matter. It is of course, not the sole way to determine semen value and a semen analysis is always the best, cheapest and 99% covered by insurance. Men with CF who have congenital bilateral absense of the vas deferens (CBAVD) still ejaculate (my husband for example-not to get too personal, but just to illustrate it accurately). What they are ejactulating if they have CBAVD is fructose and other bodily fluids that but don't include semen (if they have CBAVD).
Not sure if that was your question, but when Mark was filling out the questions I saw that one too....
Not sure if that was your question, but when Mark was filling out the questions I saw that one too....