Metaphor of baseball and dating
"Margo finally let her boyfriend get to shortstop, but she used way too much lotion and he came on her shirt." "We finally reached home base last night!
If you have never had a boyfriend/girlfriend before, then, of course, the “bases” is just a myth that’s been floating around school. I’m not sure why we use baseball metaphors for sex but we do.
Basically, they’re the levels of sexual intimacy you’ve experienced with your partner.
Don’t freak out, it’s not as scary as you think, nor does reaching one of the “bases” make you more or less of a person.
The fact is that every person has heard a high schooler brag about his romantic conquest with the lines like “yeah, I totally went to second base with Michelle last you, you know it, ha-ha”: high fives his friend.
Everyone’s heard it when they were in high school, or they were eavesdropping high schoolers to see how the newer generations have faltered, or at least in a movie.
So, in fooling around, shortstop is being masturbated by or masturbating your partner, as that's between feeling up and oral sex.
But you need to know some rules of this sport so you can understand the metaphor.
More touching, the kissing gets spicier and the breathing gets a tad heavier. [Read: How to make out and 10 steps to make it really awesome] #3 Third base.
Third base is when you and your partner are no longer paying attention to the movie that’s playing on the TV. The petting is heavy and there’s stimulation happening below the waist.
Also more ambiguous than the first base, the question what is 3rd base depends on how cool you are, so for you, it might be holding hands.
But in all fairness, it basically just evolved as things constantly get amped up with newer generations.