Most of the above posters have it right.
Irresponsible sexual behavior in teens causes physical, psychological, legal, spiritual, and emotional consequences.
Physically, teens run the risk of Aids, STD's, unwanted pregnancies, and complications of abortion when they are sexually active.
Legally, boys can have their lives ruined if they have sex with a minor (statutory rape), or are accused of doing so and the girl files charges.
Emotionally, especially for girls, it can lead to depression...as girls do still feel the stigma of being labeled loose if they are sexually active. After the fact, they may also feel badly that they are not virgins, as some girls really had it as a goal to save that gift for their future husbands.
If a teen is religious, premarital sex may be against their beliefs, so if they engage in it...they may feel they have betrayed their God.
So, while it may be "the thing to do", teens need to realize that irresponsible sex has many life-long consequences.
A young teen by the name of Joy wanted to go party with her friends from school. Her parents told her no, so she asked her Mother to take her to spend the night at her grandparents house. Her mother complied. Joy snuck out of the window; met up with her friends, got drunk and partied until the next day.
Joy, 14, left the house a virgin. When she returned to her grandparents home; she had been gang-raped, beaten and had been infected with the virus that causes AIDS. Three weeks later, Joy found out that the "flu" she thought she had was actually a baby boy.
Joy's parents, disgusted by her drinking, smoking and alcohol use-kicked her out of the house. The "friends" called her stupid and refused to even speak to her. The "boys" that raped her turned out to be 6 married men. None of these men were ever even queried about what happened to this young girl. Once again, this teen thinking only of "fun" and escape, climbed from a window of safety into a world of unmitigated danger and peril.
Joy never finished middle school, and ended up with a 20 year prison sentence as a result of the drug addiction she "picked" up at the party. She also gave birth to 2 more kids with no father to be seen or identified or help her. Today, Joy is just a memory of my older cousin that never had a chance to see the age of 21.
This is a true story. Premarital sex and drug use have no healthy or responsible place in a teen's life.
A young, beautiful 13 year old that was promoted to the 10th grade was cheering for her high school team. Another teen, saw this shapely teen ager and decided to rape her. The parents of the young girl thought their child had "brought this shame" upon herself" by wearing the cheeleader outfit and being in public.
No formal charges or even child support was asked of the criminal acting teen that destroyed the young woman's innocence and her chance to enjoy the rest of her childhood without the social, financial, physical, academic, personal and emotional chaos.The young male stole this child's education, diminished her health and made her vulnerable to a life of abuse at the hands of cruel and exploitative men.
This male teen predator may have acted in this ribald manner and harmed and abused other teens who may also have had to shoulder the burden of physical, medical, social and actual pain. Most American laws in every state have explicit rules regarding the appropriate sexual and social actions of people of a certain age. Just as a child is unable to give consent to sex; some young men and women too, are unable to give consent or full thought to the serious multiple complications of premarital sex. The cost of this act is too high a price for society and the female to pay.
If teenagers choose to be irresponsible or promiscuous, the emotional consequences are really their own issue. However, the children born to these individuals are truly the saddest consequence.
Many of the consequences have already been stated, but I will also like to add the effect of irresponsible sexual activity on the children born to teen parents. Usually the child will be born under stressful finanacial situations. Also, it is rare that teen couples stay together and get married, so the child may grow up with there being a disconnect between its mother and father. In some cases, but not all, teen parenting becomes something passed on from generation to generation until someone stops the cycle.
Despite the sexual revolution and all the free thinking nowadays, young men still look upon girls who are promiscuous as something less than desirable for wives. Other girls talk about them, too; thus, their status among their peers is clearly altered.
Teen pregnancy is a possible result. Infections due to sexually transmitted diseases is another. Teens have a high rate of infection due to HIV, Herpes and others. Both HIV and herpes are incurable. Many teens have reported not using a condom when engaging in sexual activity. Many are under the influence of alcohol, marijuana or other substances and their judgement may be impaired. The younger the person is when engaging in sexual activity, the greater chance of unwanted pregnancy or exposure to an S.T.D. because they will be engaging in this activity for a longer period of time. Every year, 1 in 4 sexually active teens contracts an S.T.D. Although the average age of menstruation has remained the same since the 1960's in the U.S., the age that females engage in sex on the average is two years earlier than previous generations. The U.S. has a high teen pregnancy rate compared to other developed countries. The consequences are economic, emotional and physical for the people involved and for society at large, financial in terms of costs for health care and other programs funded by the government.
There are two or perhaps three sets of consequences that can come with irresponsible sexual behavior.
First, there are physical consequences. Girls, of course, can become pregnant. Both girls and boys can acquire sexually transmitted diseases. These are both extremely serious consequences of irresponsible behavior.
Second, some studies argue that there are psychological consequences to irresponsible sexual behavior. Such studies argue, for example, that promiscuous teens are less happy than those who practice more responsible sexual behaviors.
Finally, there can possibly be legal consequences. Here in the US, at least, there are issues of child pornography associated with the practice of "sexting." It is also possible for a teen to get into legal trouble if their sexual partner is too much younger than they are.
There can be physical consequences such as pregnancy, abortion, and diseases, and these physical consequences can then cause mental consequences. Early sexual experiences can put a "label" on people which follows them for life. This can then have effects on future relationships and self confidence. Lack of self confidence may then cause people not to pursue career choices that they may have pursued if life were different.