 [ Symptoms ] over the past year a dent has appeared on the left side of my penis most notable during erection  i am in my late 50 is   it does not hurt but my penis is no longer straight is this something to be concerned about what could it be should i see a doctor [ Disease ] a man is sperm can be changed by his overall health and lifestyle some things that may reduce the health or number of sperm include heavy alcohol use drugs environmental toxins including pesticides and lead smoking cigarettes health problems such as mumps serious conditions like kidney disease or hormone problems medicines radiation treatment and chemotherapy for cancer age