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  1. Sexually transmitted diseases (STDs) - Symptoms and causes - Mayo Clinic

    They are spread mainly by sexual contact. STIs are caused by bacteria, viruses or parasites. A sexually transmitted infection may pass from person to person in ...

  2. Mayo Clinic Q and A: What causes erectile dysfunction and should it be checked?

    DEAR MAYO CLINIC: Is it easy to determine a direct cause of erectile dysfunction? My husband is 51 and refuses to see his doctor even though I know it's ...

  3. Erectile dysfunction: A sign of heart disease? - Mayo Clinic

    Erectile dysfunction — the inability to get and keep an erection firm enough for sex — can be an early warning sign of current or future heart problems.

  4. Erectile dysfunction: Viagra and other oral medications - Mayo Clinic

    Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the ...