Final answer:
Switzerland had the lowest adolescent pregnancy rate among the countries compared by Sedgh and others, due to its liberal approach to sex education and sexual attitudes, which includes comprehensive sex education from a young age.
Step-by-step explanation:
A cross-cultural comparison of 21 countries done by Sedgh and others (2015) showed that Switzerland had the lowest adolescent pregnancy rate among 15- to 19-year-olds. This finding can be attributed to the fact that Switzerland, along with several other European countries such as the Netherlands, Belgium, Iceland, Denmark, and Sweden, has adopted a more open and liberal approach to sex education and sexual attitudes. These countries, known for their sexual freedom and frankness, often start comprehensive sex education at a young age and have very few regulations regarding sexual images in the media. As a result, they enjoy some of the lowest rates of teen pregnancy and sexually transmitted diseases in the world, which is far lower than the rates seen in the United States.