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)
2nd Base - Hands below the belt.
3rd Base - When mouths are used below the belt. This base also includes the sex toys.
Home Plate, (Home Run) - Intercourse
5th base or 'The Dugout' - Anal Sex.
A grand slam, would be achieving all of these on a first date.
(Unless of course referring to 'The Dugout', because that's just hilarious!)
second base includes oral or heavy petting or hand jobs ,hands go below the waist
third base includes sex toys fingering
fourth base includes sexual intercourse/ going all the way (anal also)
nick:do you think she'll let you go to third base
john:i hope so .i mean its the third date
nick:well i'm only on my second date with Mary and shes gonna make me go to third base tonight
john:damn sexual bases are better than baseball hopefully i'll hit a home run soon