Yellow or green semen. Semen can look more yellow as a person gets older. Other causes could be an infection, jaundice, or a side effect of taking medicine that turns the semen yellow or green.

Understanding the Context

Brown or black semen. Semen that is black or brown commonly means old blood is present. MSN: Can green fuels clean up aviation? Scientists say math doesn’t add up Can green fuels clean up aviation?

Key Insights

Scientists say math doesn’t add up