Herpes
virus can be transmitted to the genital area from non-penetrating contact
from an infected lesion, whether that is from oral contact (most common
transmission of type 1 oral herpes virus), finger or external genital
contact. So technically a "virgin" can still have an STD without having full
intercourse.
You can
be tested to see if you have antibodies to the same herpes virus she has,
presuming she knows what type she has, but you still could be infected in
the genital area although your previous herpes may be oral. There are
medications that can reduce her risk of infecting you if you become sexually
active, and condoms, though not 100% protective, can help reduce the risk of
virus transmission.