I've been at this since December 2010, so a bit over a year. And reading other's threads like this were definitely inspiring to me, so hopefully I can add a bit.
My wife has become kind of a bulge-junkie lately, and I constantly catch her checking it out. About six months ago, she started calling me "Mr. Big" which she had called me before. And just a while back, she said "maybe I need to call you Mr. Bulge instead of Mr. Big". Very inspiring, at least to me.
Also, while having sex recently we started doing it doggy-style and she had to switch positions, saying "that's never happened before, but something was a bit uncomfortable that time." Again, inspiring to me but an indicator that I need to work on my technique a bit as I grow. Maybe I'm hitting places I haven't hit before.
I'm a closet PE-er and she has never asked the "What's going on down there?" question, but she has seemed to become a bit more sexual over the course of the last year. It could partly be attributable to the growth (from 6.25x5.75 BPELxEG to nearly 7x6) but I think it may be more due to my increased confidence (so, indirectly due to the growth).
Either way, all is fun. I can't wait to hopefully get the direct "are you bigger?" type of question, at which point I'll tell her.