Which of the following actions is not illegal?

The action described in the second choice, where two people of the same sex kiss in a public store, is not illegal and falls under the protections of free expression and personal liberties. Public displays of affection, such as kissing, are generally accepted as a form of personal expression, regardless of the sexual orientation of the individuals involved. In many jurisdictions, engaging in such behavior does not violate any laws, as long as it does not cross into more explicit behaviors or lead to public disorder.

In contrast, the other actions listed involve potential violations of laws regarding consent, public indecency, or harassment, which can lead to criminal charges. The concept of consent is crucial in sexual interactions or physical contact, while public decency laws can dictate what is acceptable behavior in certain locations. Harassment laws aim to protect individuals from unwelcome and intrusive behavior.