What are the reasons why a guy would act tense and nervous around a girl?

[Anonymous]

[Anonymous]

He's shy and likes her. Unlike what others are posting, he almost certainly does not have an erection

[Anonymous]

One of two things either attraction or disgust. Really depends on his visual queues where he looks, moving closer or further and all that fun stuff. It's hard to tell without actually seeing it.

[Anonymous]

Natural response to being uncomfortable or fearful of shame or rejection.

[Truthatanycost]

He's trying his best to hide his erection.

[Asker]

how do you even know he has a reaction?

[Asker]

erection*

[Truthatanycost]

It's just a possible reason. Think about how you'd feel being around someone and that happening...

[gandolph3]

shy, lack of confidence

[Asker]

why would he be shy? Or is it that its just his normal personality?

[gandolph3]

if you spend time with him, it could all change