more than 50% http://www.ashasexualhealth.org/stdsstis/herpes/oral-herpes/ Oral Herpes - American Sexual Health Association Oral Herpes - American Sexual Health Association herpes simplex virus type 1 View Herpes FAQs American Sexual Health Association http://www.ashasexualhealth.org/stdsstis/herpes/oral-herpes/ herpes can be spread orally American Sexual Health Association