Virgins can absolutely have sexually transmitted diseases. You should absolutely use protection for oral sex.

really?
is the a limited number of STI's and STD's we can give to each other. or is anything possible catching off each other?

Venereal diseases are classified as such because they are -generally- transmitted by sex. They are diseases and they can be commuted through blood or fluid contact in any number of different ways. Some of them can even be transmitted in birth. You can also transmit a lot of other viruses that are normally transmitted through other venues by sex. When you engage in oral sex you are exposing your immune system to the bulk of another person's full viral load. Virginity doesn't mean virally pure.

ah right. well thatnks for the info.