Teens just don’t like condoms. In the first study ever to examine global trends in teen sexual trends, researchers from the London School of Hygiene & Tropical Medicine looked at 268 studies of the sexual behavior of under-25-year-olds from South Africa to Sweden. Their findings revealed how, in all countries, social expectations of how men and women should behave frustrate campaigners' efforts to encourage safer sex. The researchers found that young women often feel their reputation will be sullied if they carry condoms, and young men often feel pressured into having sex when they get the opportunity, whether they have a condom or not. Teens also reported that they found it difficult to even discuss the possibility of sex with potential partners, which makes it difficult to plan condom use, to ask about HIV status, or whether a partner has been exposed to other STDs.