Though Rosario Dawson's acting career started at age 15 in the racy '90s movie Kids, the actress revealed to The Huffington Post that she sustained from sex as a teenager. "I didn't even have sex until I was 20," she confessed. "My mom was a teenage mom. I was deathly afraid of being a teenage mom." Rosario isn't the only actress in Hollywood to wait a bit to have sex. From Jessica Simpson waiting until marriage to Lena Dunham writing a newspaper for sex advice, here's a few more stars who've waited.