When Jessica Biel and Justin Timberlake decided they were ready to have a baby two years ago, Biel went off birth control. “Now what happens?” she wondered. “I’ve been on the Pill for so long;

how hard will it be to get pregnant?” She found herself curious about other basic facts: When should you have sex if you want to conceive—and if you don’t? “Suddenly I realized I really didn’t know what’s going on inside my own body,” says the actress, 33. “It was shocking.”
When Biel met Saundra Pelletier, founder of the nonprofit health care organization WomanCare Global, she confessed her ignorance—and the two couldn’t stop talking. Pelletier, 46, the mother of an eight-year-old son, grew up in Caribou, Maine, where “for girls, life was all about who they married and how many kids they were going to have,” she says. “Understanding how their body worked to make those choices wasn’t talked about.” Since then she’s become a leader in getting contraceptives and other feminine-care products to women in the developing world: After learning, for example, that 10 percent of African girls drop out of school because they lack menstrual protection, she launched Project Dignity to donate reusable menstrual cups (worn instead of a pad or a tampon) to 50,000 girls in places like Ethiopia and Cambodia. But only recently did she focus on the need for information in this country. “More than half of our nation’s pregnancies are unplanned, and just 22 states require public schools to teach sex education,” says Pelletier, who’s also CEO of the biotech company Evofem. “Jessica and I realized we can help change this.” Sometimes, says Biel, “you have to have the courage to stand up for what you believe in.”