OWO (Oral Without) refers to oral sex without a condom. It is offered by some sex workers, often for an additional fee. Risks: pharyngeal gonorrhea, syphilis, and HSV-1 transmission. There is no risk of HIV transmission if the oral mucosa is intact.
Recommendation from AIDS-Hilfe: Avoid OWO if there are visible lesions (canker sores, gum inflammation) or immediately after a dental cleaning.