Is it possible to get herpes from someone that performed oral sex on you?

Yes.: The virus is easily transmitted from oral secretions to the mucous membrane surfaces of both men and women. Not an uncommon route of acquisition of infection.

Agree w Dr. Raff: Herpes simplex 1 and 2 - can both be transmitted to both genital and oral area. Hiv may be transmitted if infected fluids (semen, vaginal secretions, blood) come in contact w inflamed tissue/ sore/ulceration in throat or mouth.