Even if its just a hug, he will always take a boner, I ask him why and he's like 'because its you' can someone please explain why this happens and what does it mean?
It is literally that.
My boyfriend gets excited if I kiss him (All the time) and when we first started going out hugging him did make him a bit jolly too. If you are new into the relationship it is probably because he is excited to be in a new relationship with you or you know, he is super attracted to you.
I think it is a compliment? I mean, I always took it as one.
He is clearly sexually frustrated though XD