This post indicates total ignorance as to how the vagina works. I'm not going to waste my time explaining why big dicks don't make pussies loose, but trust me, they don't.
Moving on.
I haven't read every post in this entire thread, but it occurs to me to mention that some of these "tight" pussies may actually be normal pussies suffering from a condition called
vaginismus. I just thought I'd throw that out there because I think men (especially well-endowed men having sex with young women) need to at least be aware of the condition.
I don't have vaginismus, but I am a bit on the tight side, and I experience some pain every time my 6" thick husband enters me, no matter how "ready" or well-lubed I am. Fortunately, if I am not too sore to start with, the pain will turn into pleasure in a few minutes if I am just patient with the process. I think it is important for tight women to know that the way it feels initially upon penetration (like you're being split in half...combined with an intense burning sensation) is most likely not the way it will feel if you continue patiently and build up movement gradually.
My tight vagina does cause me to become sore easily (regardless of lube -- it's true that lube is not the solution to all problems), but my husband has never been totally unable to penetrate me due to his size and my tightness.