In the context of romance, "Third Base" refers to a stage in physical intimacy between partners. It typically involves more intimate touching and sexual activity, often including manual or oral stimulation. This stage is considered more advanced than "Second Base," which usually involves kissing and fondling above the waist. The concept of bases in romance is often used as a metaphor to describe the progression of physical relationships. The "bases" are commonly categorized as follows: "First Base" involves kissing, "Second Base" includes touching above the waist, "Third Base" encompasses more intimate contact, and "Home Run" signifies sexual intercourse.