The Bases

A slang expression that uses baseball to describe how far two people have gone sexually. Typically, first base refers to kissing, second based refers to touching above the waist, sloppy second refers to touching above the waist with the mouth, third base refers to touching each other’s genitals or oral sex and fourth base or a home run refers to vaginal sex. Depending on where a person lives, the bases may be defined differently from that.