Sexual feelings are normal and occur in girls, boys, men and women. During puberty, it is normal to become more aware of the opposite sex and to have bodily reactions. In boys, the main sign of sexual feelings is erection of the penis. In girls, it is wetness of the vagina. Having sexual feelings doesn't always mean you should have sex, so you must control sexual feelings until you are truly ready for sex both physically and mentally. Do this by keeping your mind busy with other things, like reading, exercising and playing games.
Attribution: Straight Talk Foundation