Shayla and Her Girlfriend Engage in Oral Sex

Shayla and her girlfriend engage in oral sex. Shayla noticed her girlfriend had a cold sore and asked her if it was okay to have oral sex when she had a cold sore. Her girlfriend told her of course it was okay, the herpes that causes cold sores is totally different from genital herpes, and anyway you only get genital herpes from genital sex. What should Shayla and her girlfriend know?

A) There is no danger, sexually transmitted infections are only transmitted by genital or anal sex, not oral sex.
B) Indeed, the viruses are different, and you can't get genital herpes from a cold sore.
C) The type of herpes virus that causes cold sores can also cause genital herpes through oral-genital contact.
D) There is no danger; genital herpes only occurs from heterosexual intercourse.