In dating, the term "bases" is a metaphorical way of describing different levels of physical intimacy with a partner. The metaphor is based on baseball, where first base is kissing, second base is touching above the waist, third base is touching below the waist, and home base is sexual intercourse. However, the definitions of each base can vary slightly depending on who you ask. Here are some common definitions:

• First base: Kissing, including open-mouth (or French) kissing, and any other kissing-related activities.
• Second base: Touching or petting above the waist, including touching, feeling, and fondling the chest, breasts, or nipples. The exact definition can vary slightly, but the general idea is the same.
• Third base: Touching or orally stimulating below the waist, including touching, feeling, and fondling the vagina, clitoris, penis, or testicles.
• Home base: Sexual intercourse.

Its important to note that these are not technical terms, but rather casual slang for different levels of physical intimacy. The bases can also include emotional connections, such as talking and holding hands. Its important to communicate with your partner about what each base means to you both, as the definitions can vary depending on the person.