Place lips on Vagina or Clitoris (or penis if you insist) then rapidly exhale through semi-open lips to create vibration of lips and cheeks. (like when you do an impression of a horse)but being careful not to blow air directly up the vagina. the vibrations should be pleasurable for your partner.
Repeat until satisfied.
Girlfriend: "go down on me baby"
Boyfriend: 'giving the Raspberry Rippler'
Girlfriend: " OOOH that feels SOO GOOOD"
Girlfriend: "aaahh ahhhh (orgasm)"