It kills the spermicide, and the heat eats away at the rubber. It is better for the girl to carry a condom in her purse. Have sex because you want to, not because you have to. Sex, is very special. Wait it out and make sure to stay safe and be in love.
Love makes everything more special.
No matter what type of effect sex has on teens, the decision to have sex should be an important one in everyone's life. Unfortunately, for teens, approaching sex can be intimidating. Teenagers are usually sterotyped as being unable to make responsible decisions about sex. If the choice is made to prove these stats wrong, be safe and use a condom, be completely in love, and be responsible. Sex doesn't control you, you control it.