My boyfriend had a hard on in the car without me even touching him.. how is this possible?

Anonymous
I hadn't seen my boyfriend since last weekend and we were driving to a friends place an hour or so away. We were just talking then he grabbed my hand and placed it on his pants then got this huge grin on his face. He clearly had a hard on.

I literally hadn't said or done anything sexually that I'm aware of so how come this happened? We hadn't kissed prior to this either. He is 25 years old and very experienced with sex as well. Guys... explain. I took it as a compliment.
Updates
+1 y
And it continues.. today he requested a sexy picture text while he is at work. I sent him a topless one and he responded back saying he got a 90% percenter. Apparently he is very attracted to me!
My boyfriend had a hard on in the car without me even touching him.. how is this possible?
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