Erectile dysfunction (difficulty getting/keeping an erection).

Premature ejaculation (reaching orgasm too quickly).

Delayed or inhibited ejaculation (reaching orgasm too slowly or not at all).

Low libido (reduced interest in sex).

Physical causes of overall sexual dysfunction may be:

Heart diseases.

Clogged blood vessels (atherosclerosis).

High cholesterol.

High blood pressure.

Diabetes.

Obesity.

High body fat around the waist.

Parkinson's disease.

Multiple sclerosis.

Certain prescription medications.

Tobacco use.

Peyronie's disease — development of scar tissue inside the penis.

Alcoholism, smoking and other forms of substance abuse.

Sleep disorders.

Treatments for prostate cancer or enlarged prostate.

Surgeries or injuries that affect the pelvic area or spinal cord.

Low testosterone.

Psychological causes might include:

Concern about sexual performance.

Marital or relationship problems.

Depression, feelings of guilt.

Effects of past sexual trauma.

Work-related stress and anxiety.

Monetary problems.

Low self-confidence.

Lack of communication or unresolved conflict with partner.

Lack of sexual desire, sexual fantasies, or interest in sexual contact.

Inability to have or maintain an erection sufficient for sexual penetration.

Inability to reach an orgasm despite adequate sexual stimulation and signs of arousal.

Ability to achieve orgasm only during masturbation or during oral sex.

Lack of ejaculation.

Persistent erection unassociated with sexual desire.

Bloody ejaculation (This can be frightening but is usually not serious.)

Sex addiction which put you in unsafe or illegal situations for sex.

Blood tests to check your testosterone levels, blood sugar (for diabetes) and cholesterol.

Blood pressure check.

Rectal exam to check your prostate.

Examination of your penis and testicles.

Other tests can show if you have problems with blood flow to the penis.
Your doctor may also ask questions about your symptoms and your medical and sexual history. Though these questions may seem very personal, do not be embarrassed. It is important to answer honestly so the best treatment can be recommended. You may be sent to a different type of doctor (urologist, endocrinologist or sex therapist, for example) who can help you.

Follow your doctor's treatment plan for any of your medical/health conditions.

Limit your alcohol intake.

Quit smoking.

Eat a heart healthy diet.

Get regular aerobic and weight building exercise.

Get treatment if needed for any emotional or psychological problems such as stress, depression and anxiety.

Communicate better and more often with your partner.