Related for Bava Kamma 117:27

Whether a rapist or a seducer[—they pay the fine]. What is the difference between a rapist and a seducer? A rapist pays the pain payment, the seducer does not pay the pain payment. Rabbi Shimon says: Neither of them pay the pain payment because in the end she wants it. They said to him: One who has sex willingly is not similar to one who has sex unwillingly.