Which act would not be considered public indecency?

The scenario involving sexual intercourse in private is not considered public indecency because public indecency specifically pertains to acts that occur in public spaces, where others can witness them. For an act to be classified as public indecency, it typically must be visible to the general public or occur in a public place. Engaging in sexual intercourse in a private setting, such as a home or a private room, does not meet these criteria, as it is not observable by the public and thus cannot violate societal standards regarding public behavior.

In contrast, the other options all involve actions that can occur in a public context or involve behavior that is publicly observable, which would qualify them as public indecency.