I am a bi girl and i can go down and give head to a guy but find it gross to go down on a chick. I love to recieve oral sex. After i give head to a guy i am ok for a while but then gag and almost throw up everything. I then wash my hands a lot. Its worse if he cums, if he doesn't cum its not as bad.
Some thing to think of that my therapist asked me. . .
Do you feel shame in any way towards sex? Also have you any history of csa? These things can complicate things a lot.

If you have a therapist discuss it with the therapist.