The 'Just Dance' singer told Fab that the back of a yellow cab is the craziest place she has ever had sex.
She said: "[It was] in the back of a taxi in New York. It was fun. I would do it again, f**k ya. It's always fun to do things that are sneaky. Sneaky in sex is good."
Speaking about her favourite early live experience, she added: "I was 19 and I was playing a show where I was supposed to debut all this new material.
"When I sat down to play I couldn't get everyone to stop talking so I took off all my clothes. Works every time."
Earlier this month, Lady GaGa claimed that she could give herself an orgasm just by using the power of thought.