He was always to scared to tell her, fearing it would ruin their work relationship. One day, he was using his X-ray vision to watch her in her apartment. He saw her put on music and start taking her clothes off. She sat down on her bed. She was getting in the romantic mood. She was squirming around, appearing as if she was having a sexual dream. Superman thought “She’s probably dreaming about me.” He said, “You know what, I’m faster than a speeding bullet, I could fly in, fuck her and fly out, and she wouldn’t know what happened!” So he did exactly that. He flew in quickly, did her and flew away. Wonder Woman says “What the hell was that?” And then the Invisible Man says “I don’t know, but my asshole is killing me!”