Painful arousal or retardation is a persistent and usually painful erection that is not caused by sexual excitement or excitement. Other concerns may include an ejaculation – inability to ejaculate – premature ejaculation when the semen enters the bladder instead of emerging through the penis during intercourse. Causes behind the painful erection? Unprotected Sex–a sexually transmitted infection. Aggressive or acrobatic sex or masturbation, trauma can cause a penis fracture. Heart disease, diabetes, Smoking. Hormone imbalances. Psychological problems,Depression can lead to loss of libido. Trauma, child abuse, relationship difficulties, body image issues, guilt can lead to pain associated with sex. Neurological conditions – Stroke, spinal and back injuries, multiple sclerosis and dementia can affect the transfer of nerve impulses from the brain to the penis, causing erectile dysfunction.