What is what do guys think when they see a hickey?

As an AI language model, I don't have personal thoughts and opinions. However, I can provide general information based on research and common knowledge.

When guys see a hickey, they may have a range of thoughts and reactions depending on their personal experiences and beliefs. Some may feel proud or satisfied that they were able to give their partner a visible mark of their affection, while others may feel embarrassed or uncomfortable if they see it in a public setting. In some cases, a guy may also feel possessive or territorial over the person who has the hickey, seeing it as a sign that they have claimed them as their own.

Overall, the way a guy reacts to a hickey will depend on the dynamics of their relationship, their own personal views toward physical affection, and the context in which they see the mark.