First Base - Simply put, first base is kissing. Some people define it only as French kissing, while others include all kissing.

Second Base - This is going up a girls shirt and fondling her breasts. It also includes using the mouth on the breasts.

Third Base - This encompasses the most sexual activities. Third base is any touching of the genitals. Thus masturbating your partner whether it is fingering the girl or giving the guy a hand job.

Fourth base - oral sex. Giving a guy a blowjob or eating out a girl out is also considered to be getting to fourth base.

Home Plate � Reaching home is used to refer to having sex.