I say it depends on where you're putting it. If it's the vag, probably not because if your girl's getting hot enough, she'll supply the proper amount to let your tool slide. If it's the ass, then I'd say you'll need to slather alot on your dick just so that there's not a great deal of trauma to the anal walls.
If they're talking about the amount of lube used, I don't think it matters or will even tip them off to your tremendous size. What does tip them off is the way you grasp your bulge every time you walk around them and say "Oooh my cock is sooo big!"