I'm not too turned on by extra large penises. My favorite position is doggy-style and that tends to hurt if the penis is too long or if your cries for help are mistaken as cries of pleasure. Also, I enjoy giving blowjobs and pride myself on being able to suppress my gag reflex but even my most heroic attempts will not allow me to swallow an extra large member. That hurts my pride.
My husband, while of average length, is very very wide. I find that to be more enjoyable, personally.