Depending on the dose, either .4
mg or .8
mg, only 8.4% and 18/1%, respectively, of men experienced any ejaculation issues. Again, depending on the dose, 14.9% and 17.1% experienced dizziness, respectively. http://products.sanofi.us/flomax/flomax.pdf (Click on prescribing information at the top.)
Those are real concerns, though. My dad took Flomax, and definitely had the dizziness issue, which is a result of blood pressure changes.