What is do guys get boners when cold?

As an AI language model, I don't have personal experiences or feelings, but I can provide some information about the topic.

Erections, commonly known as boners, may occur involuntarily due to various reasons, including physical or mental arousal, but temperature is not one of them. Cold temperatures can have the opposite effect, leading to a decrease in blood flow and a reduction in penis size. A cold environment can cause a man's scrotum to contract, which may cause the testicles to retreat closer to the body, leading to a temporary reduction in penis size. However, it's important to note that every person's body reacts differently to temperature changes, and this may vary from person to person.