The bases in dating refer to different levels of physical and emotional intimacy that someone may reach with their partner. The baseball metaphor is commonly used to describe these levels of intimacy. The bases are not technical terms, but rather casual slang for different levels of sex and relationships. The following are the most common definitions of the bases in dating:

• First base: Kissing, making out, and French kissing. Anything you might do on a first or second date is usually included in first base.

• Second base: Touching or petting above the waist, including touching the chest, breasts, or nipples. Definitions vary slightly on whether this is over the shirt or under the shirt, but the general idea is the same.

• Third base: Touching or kissing of genitalia without clothes, including oral sex.

• Home run: Sexual intercourse.

It is important to note that these definitions are subjective and may vary depending on the individual. The bases can also be different for everyone, and people may change the definitions based on what they have heard in the past. Ultimately, it is up to each person and their partner to decide what constitutes a base in their own relationship.