Background: Risk-taking behaviours such as early initiation of smoking, alcohol drinking and
sexual activity often cluster within individuals and could be characteristics of adolescents …

Aim: First intercourse at the age of 14 years or younger is usually considered high-risk
behaviour for sexually transmitted infections (STIs). It has been linked to other types of risky …

Age at first intercourse among Norwegian adolescents was studied by means of survival
analysis. The data stemmed from a nation-wide survey of 3000 Norwegian adolescents …

OBJECTIVE: To investigate associations between early smoking initiation, risk-taking
behavior and reproductive health. METHOD: A random sample of 69,486 women aged 18 …

Introduction Sexual behavior at the population level impacts on public health. Recent
representative sexual behavior data are lacking. Material and methods Cross‐sectional …

Scand J Caring Sci; 2013; 27; 20–26 Early onset of sexual intercourse is an indicator for
hazardous lifestyle and problematic life situation Background: In public health efforts …

Background: This study was carried out to determine whether having first vaginal intercourse
before 15 years of age is independently associated with sexual risk behaviours in Canadian …

Background: Sexual activity is often initiated during the adolescent period, and previous
research suggests that the age of first sexual intercourse and condom use are crucial …

Aim. To compare life‐style and reproductive health care factors in girls with a coitus debut<
15 years of age and girls with a later debut. Methods: Girls resident in the municipality of …

PURPOSE: To describe variations in age differences (ADs) between partners at first
heterosexual intercourse and to examine associations between this AD, sociodemographic …