I've gotten that alot, I think what it comes down to is that the majority of dudes have a small penis, and of course most act like it's huge.
So when someone huge does come around they're tongue tied.
Now to answer your question as how to handle a situation like that, it depends.
If she's willing then go for it, just be loving, don't try and rip her apart.
If she says OMG! there's no way, then lady luck would definately have to be on your side.
I've found the best way for me when it comes to dealing with this situation is to make sure they're very wet, dripping in fact, making them cum first from sucking their hot juicy hole helps also, then it's easier to slide my thick cock inside.