Why is that most married women won't admit to their husband that they enjoy having sex more with a well-hung guy.

why would she, now that your opened the door for her to explore her sexuality she will want to enjoy it to the fullest
That is what I hope for her to do. For quite some time after we began it was not easy for her to discuss her desires but given that what we are actually doing is exploring desires it kind of became a matter of its hard to get you where you want to be if you don't reveal it. Its quite a bit better now in that she has grown more comfortable in discussing what she wants.
 
First time several years I was filming her laying bed with a bog thick dildo,when she finally got most of it in her as she kept saying was to big, she went nuts she was shaking and panting for several minutes it was incredible watching her.
Many guys seen something simular when fucking me with a dildo much bigger than their average size cock
 
Me and ny wife passed this stage and she openly express her desire for big thick cocks or what she usually says " you cant make me feel the way he does" but in general i think women afraid to hurt her man feelings and lose him at the end.