What is do guys get boners from seeing a girl they like?

As an AI language model, I don't have personal preferences or feelings but in general, it is possible for guys to get an erection (or "boner") when they see or think about someone they find attractive or sexually appealing. This can happen regardless of whether or not they have an established emotional connection with that person. Erections are a normal physiological response to sexual stimulation, and they happen when the blood vessels in the penis expand and fill with blood. It's important to note that not all men will become visibly erect in every situation where they may feel aroused, and that getting an erection doesn't necessarily mean someone wants to have sex or engage in sexual activity.