What are teenagers' biggest sexual taboos? In this groundbreaking five-part series, we uncover the forbidden territories of sex and give the lowdown on facts usually shrouded beneath layers of bravado, misinformation and myth. Young people aged 16-18 talk frankly and openly about their experiences of masturbation, sexually transmitted infections, using condoms, choosing abstinence and wondering how they 'measure up' to their friends. All the teenagers – apart from those featured in Programme 5 who have chosen to abstain – are sexually active. Whether they are in long-term relationships, happily single or into one-night stands, or are straight, gay or bisexual, they bring a wide and sometimes surprising range of experiences to the show. Experts are on hand to provide commentary and factual information.