I once discovered that I had a dick twin: same exact length, breadth, curve...everything! As he was also a strict top, we didn't get much further than some oral, which while challenging, we agreed, was hardly worth all the fuss we'd both heard so often.
For the months we hung out, we were mostly drinking buddies. After a couple of shots we'd brag about our being dick twins and occasionally haul out the knobs for a hands-on inspection.
On one occasion we brought a bottom back and took turns on him. He agreed that we were in every way identical in cock and balls. He had a nicer ass, I had better legs, we each had essentially the same chest, but he didn't have the spark-plug nipples I do and never understood why they were such a requirement for me.