Northwestern University President Morton Schapiro said Thursday he was launching an investigation into an on-campus presentation involving a live sex act performed for students as part of an optional after-class lecture. Schapiro described himself in a statement as "troubled and disappointed" about the use of a high-powered sex toy on a naked 25-year-old woman by her 45-year-old fiance to bring her to orgasm in front of more than 100 students.