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Yes, oral sex could transmit STD (sexually transmitted disease) and they are herpes simplex, gonorrhea or even syphilis. Infections less frequently passed on include chlamydia, HIV and hepatitis A. But, I must tell you that the risks of getting an STD from unprotected oral sex are typically much lower than the risks posed by having unprotected vaginal or anal sex. This is because saliva often contains the antibacterial and antiviral agents. However, as you do not have any associated sore throat or blisters on the mouth or lip; the chance of contracting STD is a bit remote. Just look for your discharge. As it is odorless as well as non-itchy, it could be due to the pills, as you are thinking. Are you on Celexa (Citalopram) for less than eight weeks? Vaginal discharge is found also among people who take Celexa and it could be a cause. I think of a rescreen if it persists for more than a week or changes its behavior as you never know how you could contract STD.