Several things, both emotional and physical. Depending on your age, some common issues can be diabetes, blood pressure, prostate trouble, and medications you take. But it is worth talking to your...
Impotent means he can't get it up. so if he can manage to get it up he can have a baby. If he is sterile, that means he has no sperm and he cannot have a baby.
One technique is to wrap and secure a small roll of postage stamps around the flaccid penis at bedtime. Upon awaking, if the roll of stamps is broken, it means the man experienced an erection during...