In the shortest terms, baseball is a game in which a person with the bat, called the batter, needs to hit the ball thrown at him by the opponent and then claim the bases spread around the pitch in succession.The three bases and the place where the batter is standing while hitting the ball (home plate) make for a rhomboid (see the picture), and the claiming is done by touching the bases which are represented by white squares.That is only scraping the rules of baseball, which doesn’t look as complicated as it is, but it is enough for our needs.So, getting bases are good, the higher the base you claim the closer you are to your goal of achieving a home-run.I'm from England and when I was in high school (so up to 4 years ago) it was common practice to use the same metaphor, and for the most part, everyone had a different definition of what each base stood for.Nobody really cared much for where the metaphor came from, then again, this could be due to it being a girls-only school.Note that, in the baseball metaphor, there is an implicit "escalation" idea baked into the metaphor.
While on the prowl, if one of the two was failing to make a pick up, the other would say "cross it" to mean that it was now his turn to make a move. Doesn't parallel the baseball euphemisms but it gives you an idea of what is likely out there in the dating pool today.
I had two British friends who used soccer terminology to refer to some of their shenanigans.
A yellow card was a minor and forgivable sexual violation.
There are lots of English-speaking (or English-learning) countries where baseball simply isn't played much if at all.
Other sports -- soccer, rugby, polo, cricket -- are likely more common.