‘Sexual and romantic development, early parenthood, and emerging adulthood’ explains that as adolescents start to become reproductively mature at puberty, interest in sexual behaviour and partnerships increases. From associating primarily with same-sex friends during middle childhood, there is typically an increased interest in relationships with the opposite sex from the early to mid-teens onwards. Some experience of same-sex sexual behaviours is also not uncommon, and a minority of adolescents will describe themselves as lesbian, gay, or bisexual. Intimate partnerships start to be formed, with sexual and romantic elements. The issues of dating violence, sexting, teenage pregnancies, and early parenthood are considered along with the extended period of development in emerging adulthood.