Reply To: I froze at the clinic and did not mention oral sex. Should I go back?

Go back. You will not be the first person that day, let alone that week. They ask about sites of exposure for exactly one reason, which is to decide where to swab, and a urine sample genuinely tells them nothing about your throat or rectum.

You do not have to explain why you did not say it the first time. “I want to add throat and rectal swabs” is a complete sentence.