Is my son asexual?

My 12 and 10 year old sons are both going through puberty but claim to have zero attraction to either sex, to the point where they are both truly concerned about it. They’re 100% male acting, genuinely love explosions, fights, all the Rambo testosterone fueled stuff and always have. I get the impression (from what little I’ve seen) that asexuality seems to go with less traditionally masculine guys. Is this correct? What are the odds of having TWO asexual kids? I’m just trying to figure this out. Their mother and I were crushing hard in Kindergarten, so this is so foreign to us.