Batman, Robin, Spiderman, and the Hulk have already arrived.

 Superman is especially ready to party after a hard week of saving  the world. So he throws on his cape and heads off.

Along the way, he passes Wonder Woman's penthouse suite. To his  surprise, he sees through her open window that she is still at home, naked lying with her legs apart.

Feeling a bit in the mood, he thinks to himself, "I'm faster than A speeding bullet. I can fly in there, have sex with her, and be gone before she knows it."

 So in an instant, Superman flies in, does the deed, and flies back out, with a great big smile on his face.

At this point, Wonder Woman sits up and says, "did you hear  something?"

 "Nope," replies the Invisible Man, "but my ass is killing me."