Baseball's Guide to Sex used to consist of four vaguely defined bases. There would often be confusion amongst Bros about how far you'd gotten the night before. Did you get to second or third? Maybe you were stranded at first. That is no longer an issue, thanks to the new and improved Baseball's Guide to Sex.

The terminology, for your consideration:

• On Deck: Flirting/Holding hands
• Strikeout: Obvious
• First Base: Kissing
• Second Base: Shirts off
• Third Base: Touching below the belt, no pants
• Home Run: Full-blown intercourse
• Baseball Bat: Again, obvious 
• Inside-the-Park Home Run: Oral Sex
• Ground-Rule Double: Hand job
• Broken Bat: Impotency
• Warning Track: Pubic Area
• Pine Tar: Lube
• Trade: Swingers
• Box Seats: Sex on a water bed
• Cheap Seats: Sex on the floor
• Steroids: Viagra
• Switch Hitter: Bisexual
• Perfect Week: Taking a girl home for 7 days straight
• Grand Slam: Threesome
• Rain Delay: Parents/Roommates come home early
• Rain-Shortened Game: Quickie
• Hitting For the Cycle: Having sex with 4 different girls in one weekend
• Hall of Fame: Sex with 250 women lifetime
• Hall of Fame Weekend: Different girl on Friday, Saturday, Sunday
• Batter's Box: Bed
• Rally Cap: Ribbed condom
• Balk: Finishing prematurely
• Rookie: Virgin
• Relief Pitcher: Vibrator
• Doubleheader: Sex Twice in one day
• Batting Practice: Yanking it
• Error: Condom breaks
• Gambling on the Game: Sex without a condom
• 7th inning Stretch: Unusual positions
• Closer: Your signature "finishing" move
• Scoring Position: About to have sex
• Head first slide into second: Motorboat
• Double play: Pleasing two girls at once
• Retirement: Marriage