From a medical professional point of view, it is possible to transmit syphilis from a cup. The ability of the cup to transmit syphilis depends on whether the cup is used by the same person. If the cup is always for personal use, and the user does not have a history of syphilis, generally will not be infected with syphilis. However, after the last use of the airplane cup, the semen left in the cup, because of the rich protein, easy to cause bacteria breeding. When the cup is not thoroughly cleaned and used again, bacteria can cause genitourinary infections such as glansitis, urethritis and acute prostatitis through the urethral opening or the mucous membrane of the glans.