Syphilis is spread: Through direct contact with a syphilis sore or rash during vaginal, oral, or anal sex. Sores can be on or in the external genitals, vagina, anus, or rectum. They can also be on the lips or tongue or other parts of the body. From a mother to her baby during pregnancy, childbirth, or breastfeeding.
Both state and federal laws protect employees from sexual harassment at work. Sexual harassment is a form of sex discrimination under Title VII of the Civil Rights Act of 1964. While Title VII is the base level for sexual harassment claims, states have sexual harassment laws which may be even more strict.
Harassment law can't be supported in other ways, for instance using the fighting words exception, the government as employer doctrine, the speech-as-evidence principle, or other arguments. Creating a new exception would be tremendously dangerous for free speech, both in the workplace and out of it.