I don't think all hung guys are lazy lovers. I have been quiet fortunate to have energetic, attentive, thorough lovers who happeed to hung. By the same token i have had the same experiences with guys who would qualify as small and everything in between. It really comes down to the dudes over all personallity, and ego.
I did have a horrid string of "lazy" large cocked lovers while I still lived in Sacremento. I attribute it to the fact that they were fairly stuck up andvain, with ego's the size of Jupiter that were not helped by the fact they were hung. They seemed to think that the mere fact of them having a big dick,should have been enough for me to cum seven times over. Even when i didn't they would seem to think that once they got their nut, tht I should be satisfied even though i didnt get mine. The worst was a guy wo was a true 9 3/4 x 6 1/4 (yes I measured, at his insistance) who was worthless in bed. No imagination, no variation, zip. Just a dull pump, pump. Ugh. He had the audacity to tell me I as the best he ever had, to which I made a scathing comment that effectively ebded the scene.
But, the same can be said for smaller guys. One would think that they would go the extra mile to please. Nope. Not all of them. I don't know if they were thinking "I'm small, i can't please him, so why try" (which is sooo not true!, just be attentive!) or what, but seriously, some of them were terrible.
Having had both wonderful and horrendous fucks all along the size spectrum, I can honestly say that larger guys are no more or less likely to be lazy lovers than small, or average dudes.
