Skip to main content
fifth base

fifth base

9.9
A slang phrase for having sex as the final step in dating
  • noun
  • /fɪfθ beɪs/
  • Offensive
translation icon : echar un polvo (informal, vulgar)
  • After months together, the couple decided they were ready for fifth base.

Examples

  • After their romantic dinner, they ended up at fifth base.

  • Some people debate what exactly counts as fifth base in a relationship.

  • They laughed about how fifth base was never even discussed in high school.

  • They finally reached fifth base after months of dating.

  • After months of dating, they felt comfortable enough to move to fifth base.

  • In their conversation, they joked about the awkward moments leading up to fifth base.

  • Many teens wonder when they will finally reach fifth base in their relationships.

How Intimate

fifth base
  • Offensive
9.9
oral sex
  • Offensive
50 6.0
petting
  • NSFW
34 7.1
to make out
  • NSFW
130 8.1
kissing
  • NSFW
100 1.0
hand-holding
1 1.9

Surface Forms

fifth base singular
fifth bases plural

Morphology

fifth + base

The phrase literally combines 'fifth' (an ordinal) and 'base' (a baseball station), which signals a staged progression and therefore gives a partial clue that it denotes a further 'stage' beyond the known four bases. However, the specific meaning—an advanced stage of sexual activity—is slangic, culturally rooted in the baseball-as-dating-metaphor mapping, and not derivable from the literal words by a B1 learner without exposure, making it only partially transparent.

Etymology

Fifth base comes from baseball. In the game players run from base to base, and people used each 'base' as a way to talk about steps of closeness in dating. So one popular story says a joking fifth base means 'having sex'.