tled "Engaging in illicit sexual conduct in foreign places" and reaching people "who vel( ) in for- eign commerce"); see also Sale Haitian Ctrs. Council, Inc., 509 U.S. 155, 176, 13 S.Ct. 2549, 125 L.Ed.2d 128 (1993) (explaining that there must be "affirmative evidence of intended extraterritorial appli