Syphilophobia

Freudian Dictionary

Castration anxiety persists in the guise of syphilophobia, after it has been learned that castration is no longer customary as a punishment for giving the sexual appetites free rein but that serious diseases threaten intinctual freedom instead.

I may refer to the case of a young man who became agoraphobic because he was afraid of yielding to the allurements of prostitutes and of acquiring syphilis as a punishment.