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@Ortofenylofenolan_sodu:

Low levels or no sperm exists in pre-ejaculate, although studies examined small samples of men.[4][6] Two contrary studies found mixed evidence, including individual cases of a high sperm concentration.[7][8] Popular belief – dating to a 1966 Masters and Johnson study[9] – stated that pre-ejaculate may contain sperm that can cause pregnancy, which is a common basis of argument against the use of coitus interruptus (withdrawal) as a contraceptive method.