Bases

baseball as a sexual metaphor

Going up to bat: Attempting
Bullpen: Foreplay
1st base: French kissing
2nd base: Above the waist
3rd base: Below the waist
Home Run: Sex
Grand Slam: Four times in twelve hours
Foul Ball: Ass sex
Strike out: Not getting it up
Line Drive: One night stand
10 Run Rule: Finishing on your own
Pop fly: Stealing virginity
Bunt: Pre-mature ejaculation
Gapper: Easy lay
Bases loaded: Threesome
Third base coach: The person who's filmming
Stealing bases: Rape (rape is bad)
Double/Triple play: Multiple Orgasms
Cup: condom
Steroids: Birth control
Error: No Orgasm
Broken Bat: Broken dick
Extra Innings: Four times in a row
Bench Warmer: Peeping Tom
Bat boy: Fluffer
Field: Heartshaped bed
Dugout: Back seat of a car

Baseball terms used as sexual metaphors. Most commonly referring to the bases.
1st base= Kissing, french kissing
2nd base= Groping, feeling, fingering
3rd base= Oral sex, 69, handjob, pretty much anything but all-out sex
Home run= Full-on sex, penetration

Many people have different variations for first, second, and third base.

first base-making out
second base-gettin felt up
third base-giving head,hand job,etc
home run-sex

"Sex Bases"

In relation to baseball, these terms are used as describing how far someone has gone with someone sexually. 4 F's.

1st Base: French (Makeing-out, french kissing)
2nd Base: Feel (getting felt up, feeling eachothers genitals)
3rd Base: Finger ("fingering", blowjob, handjob ECT)
Home Run: Fuck (AKA: "Going all the way" ie: having sex)

French, Feel, Finger, Fuck.

The things a runner must touch in order to get a home run in baseball. Quite frankly, I'm surprised that you don't know this. "Baseball" is America's favorite pastime ;).

This is the Australian version:
1st Base- kissing (french, obviously)
2nd base- Hand job or fingering
3rd Base- Head
4th Base/homerun- sex

The different levels in a sexual relationships. Included but not limited to first base, second base, third base, and home plate.