Oral herpes (Herpes-type 1): is usually transmitted from mouth to mouth so avoid kissing someone with cold sores or any blisters on their mouth. HSV-1 can also be transmitted during oral sex and become genital herpes for the receiving partner. This infection is very common and many young kids are infected before they are even 5years old because of adults who kiss babies on their lips. Herpes (HSV-2 or Genital Herpes): Even though it is commonly called genital herpes, it is possible to transmit HSV-2 to your partner’s mouth during oral sex. If you think you have an active herpes lesion, please stay off sex until it goes away to avoid infecting someone else.