The given term "coutch" seems to be a misspelling or typo of the word "couch". In the context of adult videos, when referring to sexual activities on a couch or involving a couch, it can be understood as follows:
Couch (or Coutch): A scene or act where individuals engage in sexual activities or positions on a couch. This can include various acts such as oral sex, penetration, or other intimate contact. The term emphasizes the setting of the action, which is on a piece of furniture commonly found in living rooms or other indoor spaces.
Please note that "couch" may not be specific to English and could potentially be an anglicized spelling of a different word from another language. However, it's clear from the context that this tag refers to sexual activities involving a couch.