- Age is a major factor. As men age, their semen often changes color. There may be a slight yellow tint to it, which gradually appears over time. Most men do not even notice.
- Your diet can affect the color of your semen. Consuming large amounts of sulfur may cause your semen to look yellow. Some foods with lots of sulfur are grains, cabbage, broccoli, nuts, and asparagus. Garlic and onions have also been known to contain large amounts of sulfur. You could try eating less of these foods or drink more water to flush the sulfur out of your system.
- Taking multivitamin supplements could cause your semen to turn yellow. If you’re currently taking vitamins, you should stop taking them for a while and see if your ejaculate returns to its normal color.
- If it’s been a while since you last ejaculated, your semen may look yellow because it’s older. When you don’t ejaculate for a while, the semen gathers in the seminal vesicle and thickens. When it finally comes out, it may look lumpy and discolored.
- Your semen may contain urine. When a man has an erection, the flow of urine is obstructed so the only discharge expelled is the ejaculate. However, sometimes a small amount of urine can end up in the semen, making it yellow. You can avoid this by urinating prior to any sexual encounter.
- Often times, abnormal semen color or consistency is caused by medical conditions. If your semen is yellow or green, it may be a sign of a prostate infection. Lumpy or thick ejaculate could indicate a hormone deficiency. Pink, dark brown, or red ejaculate may mean there is blood in the semen, a sign of bleeding in the prostate.
- Sexually transmitted diseases can sometimes change your semen’s color, and likely its odor as well. Chlamydia and gonorrhea would be the most likely to change your semen yellow. If your semen has an odd smell, it might be a sexually transmitted disease.
Yellow semen is normally not a reason for serious concern. If it doesn’t happen too often, it may be a temporary condition caused by abstinence, multivitamins, or your diet. However, if the condition persists for several weeks, you should talk to your doctor. You could have a severe infection that needs to be treated.
Reference:
http://www.wisegeek.org/what-are-the-common-causes-of-yellow-semen.htm