Can oral herpes become genital herpes when performing oral sex even when not having any breakouts ?

Herpes: Herpes is caused by two viruses. Type one, the more common one, used to be called oral. The less common, type two used to be called genital. They are no longer called that because herpese viruses can infect any part of the human where exposed. But, one can only get infected once from each virus.

Yes: Genital herpes can cause oral infection and oral herpes can cause genital infections even when no eruptions are present although transmission of the virus is much more likely during breakouts. 20% of all adults are infected with genital herpes and up to 80% of adults are infected with oral herpes and the virus can be transmitted even when there are no symptoms.