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.

1st Base - Is Kissing, french, open mouth or just a peck. Also any above the belt touching is included in this base

2nd Base - Hands below the belt. Fingering for girls or hand jobs for the guys.

3rd Base - When mouths are used below the belt. Essentially going down on a guy or girl. also This base includes the sex toys.

4th Base or Home base/plate - Going "all the way," doing the deed, Slamming it, Fucking, Sex, intercourse, "doin it," getting friskey so on and so forth.

(some people use a 5th base or a 'grand slam' to refer to anal sex while other include it in the 4th base. its really up to the individuals wheter they want to include it)