I've been on flomax for about a year (possibly 2, I forget). After 2 weeks it improved the ability to urinate and decreased needed trips in the night. Definitely decreases semen volume, but definitely does not decrease libido in me, nor decrease firmness of erections. Makes ejaculation more difficult (although that could have another cause as well, frequency of ejaculates). I take 1 per day. Would like to have quicker, not less quick, climax/ejaculation events, but the drug helps with the enlarged prostate-caused urine problems. Age 64.