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A normative aspect of the adolescent period is sexual exploration and associated decision making regarding how “far to go” sexually. Transitioning from being a virgin to a sexually active teen is meaningful in terms of both personal and social identity. Teenagers may view sex with a boyfriend or girlfriend as a step toward greater commitment and intimacy in their relationship. It also represents a developmental marker toward adulthood and sets the groundwork for later adult sexual relationships. At the same time, teenage sexual intercourse is a public issue in part because of health concerns stemming from sexually transmitted infections, involuntary sex, and teenage pregnancy.

Sexuality is a broad concept and can refer to many types of sexual behaviors, attitudes, and desires, not just sexual intercourse. Recently, researchers have paid more attention to sexual activities besides sexual intercourse, such as oral sex. Oral sex among adolescents is of interest because of sexual health risks associated with oral sex and the notion that oral sex is a way to satisfy sexual desires and maintain virginity and avoid pregnancy. There is a sense that oral sex is the precursor to sexual intercourse. Although it is important to consider a full range of sexual behaviors (e.g., masturbation, genital stimulation, anal sex, oral sex), this entry focuses on sexual intercourse. This approach could result in excluding sexual minority youth, so they are showcased later in the entry.

Trends

The context of teenage sexuality has changed. In 1950, the median age at marriage for women was 20, so a considerable proportion of teenage sex occurred within the confines of marriage. Today, the average age at marriage is 25.5 for women; as a result, most teenage sex occurs outside of marriage.

Despite the media and public concerns, there has been a slight decline in the proportion of teens who report that they have had sexual intercourse. In 1995, 53 percent of high school students reported having had sex, and in 2005, 47 percent did so. Thus, a considerable proportion of teenagers have not had sexual intercourse prior to graduation. Further, most teens did not recently have sex; only about one third of high school students report having had sexual intercourse in the last 3 months. When studying the sexual behavior of adolescents, it is important to consider their specific ages because the proportion of sexually active youth increases by age, suggesting an important developmental trend. For example, according to the 2002 National Survey of Family Growth, 13 percent of 15-year-olds have had sexual intercourse, but about half of 18-year-olds and 70 percent of 19-year-olds report ever having had sexual intercourse.

Sexual Initiation

Decisions about initiating sexual intercourse include a range of motivations, such as social factors including parental or peer approval/disapproval, opportunities for sexual activity, romantic relationship dynamics, religious beliefs, and perceptions of health beliefs and pregnancy risks. Recent longitudinal analyses, which have included all of these factors, suggest that peer social network behavior and relationship dynamics—being in love, religious beliefs, and opportunity—are significantly related to whether teens initiate sex. Furthermore, situational context factors such as alcohol and drug use have been found to influence sexual initiation. Some research focuses on the voluntary nature of sexual activity and finds that alcohol and drugs are tied to regrettable or involuntary sexual experiences. Thus, the decision to initiate sexual activity is complex and involves multiple perceptual, social, and interactional domains.

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