Jerika recently read the best-selling book "50 Shades of Grey," and she and her boyfriend, Eric, are “interested in exploring new ways to spice up our sex life.” Sex expert Emily Morse encourages people to communicate their fantasies to their partner. Before experimenting, she says, partners should establish a safe word. She suggests using traffic light signals — red, yellow, green — so that your partner knows when you’re not comfortable and want to stop.