11.   Although a minority of teen-agers engage in sexual activity, those who do often have unprotected sex.

12.   Although love is not treated as abstract in Austen fiction, it seems quite removed from sexual activity.

13.   Among the problems associated with binge-drinking are academic difficulties, unplanned sexual activity and vandalism.

14.   Among those were stipulations that any club can be denied authorization if it advocated or approved of sexual activity outside marriage or violated state laws regarding sex education.

15.   And according to the federal Centers for Disease Control and Prevention, prevention programs have increased condom use among teenagers without increasing their level of sexual activity.

16.   And in practice, she noted, the laws are enforced almost exclusively against same-sex sexual activity.

17.   And once the males are in, the sexual activity becomes as freewheeling as a Dionysian holiday.

18.   And researchers long assumed that tampon use and sexual activity would only worsen the backup.

19.   And integrating sexual activity into those lives is probably the most complex job of all, for patients and doctors alike.

20.   And the term fornication is broadly used to describe sexual activity outside marriage, with a warning of spiritual punishment to come to the unrepentant.