If he got one circumcised it might settle the debate about sensitivity between the cut and the uncut. Plus he could offer his sex partners a choice about which they prefer to suck. I'd take the uncut.
One of my favorite ways of masturbating a guy is between my lubed palms, fingers interlocked with our dicks squeezed tight together, a double wank. Having a handful of 3 hardons might be hawt.
BTW, has he said if he (or someone else) strokes just 1, do they both cum? I see endless possibilities here. He could stroke 1 while I stroke the other. He could fuck me with 1 (with a condom), and when he cums the "spare" would shoot on my back or belly.