Remember when we said that blood in your urine was a major warning sign? Blood in your semen is the same way. If you are over 40 and see blood after you ejaculate, then it is important to visit your doctor immediately because you may have advanced prostate cancer.
16. Painful climax
While there may not be blood in your semen, other aspects of your sex life can be a warning sign of prostate cancer. This includes if you experience pain when climaxing and/or if you have a noticeably reduced volume of semen (though the latter can be affected by both what you have been eating and how much water you have been drinking).