However, older teens (ages 16-18) are more influenced to have non-romantic sex by environmental factors, such as coming from economically disadvantaged households, little parental involvement and poor school systems.

In a related study, published in the June issue of , Harden and Mendle dispelled a commonly held theory that smart teens delay sex.

I will discuss this in general terms first before we delve into the subject of sex during the reconnecting phase with your ex.

You know the rule of not having sex with a guy till 3rd or 5th (or put the number here) date? Actually the last 2 long term relationships I had including the one with my husband (9 years and 8 years), we had sex the first time we met. I've always had a strong connection with guys with whom the physical attraction was so instant and it usually grew into something more than just sexual (some of them became my very good friends).

They found family environmental factors, rather than intelligence, were more important influences on teenage sexual activity.

The second study also used data from the National Longitudinal Study of Adolescent Health.

Genes related to impulsivity, extroversion and early puberty may influence young adolescents to have sex in non-dating relationships.

These same genes may also put them at risk for adverse psychological outcomes, Harden says.To better understand what influences teenagers to have sex in dating relationships and with non-dating partners, the researchers examined environmental and genetic variables that predispose adolescents to risky sexual behaviors.Harden found genes significantly influence sexual behavior among young teens (ages 13-15).Sexually active teens in committed, romantic relationships are less likely to engage in delinquent behavior than teens who have casual sex, according to new research from psychologists at The University of Texas at Austin.The study, published in the June issue of the , found teenagers who are sexually active in dating relationships show lower levels of antisocial behavior compared to teenagers who are not having sex at all.By comparing twins, researchers could control for all genetic and environmental background variables that twins share.

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