Why smart guys brag about their penis size?

Anonymous
I have this situation with a guy where our relationship is on that state where you know you like each other, but you won't tell it directly.
The guy is a very mature person, very smart, talented and very attractive. Definitely not someone who has only his penis to brag with. He's actually not bragging for any of his major talents. Just not that type of person.

But! I can see that he wants to get my attention on his penis, who's obviously remarkable :) He's a musician and I'm often part of his show's rehearsals, so he would invite me
in the dressing room to talk about work not when he's shirtless (he gained weight), but exactly when he's about to put his pants on.
And once he made a hint with a song, referring to his penis size.
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Can it be because he's really attracted to me sexually (he shows signs of that) and he wants me to know that he can make me very happy in bed?
Oh, and he would also play on his guitar for me only, so I guess this is the same type of bragging.
Why smart guys brag about their penis size?
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