100 Girls (2000)

This sexy, teen-comedy is about a freshman at college who meets his dream girl in a dorm elevator during a blackout. They make love. He never sees her face, but instantly falls in love. In the morning, the power is restored, but the "dream girl" has vanished. All Matthew knows is that she lives in an all-girls dorm. He sets out on a semester-long journey to find his mystery girl amongst a hundred female suspects.

Could it be Wendy (Larisa Oleynik)? Dora (Marissa Ribisi)? Arlene (Katherine Heigl)? Patty (Emmanuelle Chriqui)? Cynthia (Jaime Pressly)? Maybe Matthew's roomate, Rod (James De Bello) knows. Or maybe it's one of the 95 other girls in the Virgin Vault Dorm, any of whom could have been in that elevator, making love with Matthew.

More Info:
http://imdb.com/title/tt0214388/