Madonna was offered a record deal in exchange for sex.
The 60-year-old singer admitted she lost count of the number of unwanted advances she turned down at the beginning of her career and she wishes more women in the music industry were more "outspoken" about their experiences.
She said: "I can't tell you how many men said: 'OK, well, if you give me a blow job', or: 'OK, if you sleep with me.' Sex is the trade, you know?
"I feel like maybe there isn't a movement so much because we're already used to expressing ourselves in a way, or fighting for things, although I do wish there were more women in the music business that were more political and more outspoken about all things in life, not just ... the inequality of the sexes."
But the Vogue hitmaker thinks musicians are able to speak for themselves in a way that actors are not because they don't face the same pressures from producers or studios.