Yes, Oral Herpes (cold sores / mouth herpes) can cause genital herpes, typically via oral sex. Genitals Herpes can
also transmit to the mouth area via oral sex.
Both Oral and Genital Herpes are caused by
Herpes Simplex. Oral Herpes by
HSV1 and
Genital Herpes by HSV2.
The two viruses
are very similar and are both highly adaptable.