I told my wife that I started Penis Enlargement'ing about two months ago. At first she didn't want me to do it, but accepted it because it was something that I wanted. Now her attitude towards it is much more laid back. She's even cuious about it. Some nights she even asks me if I'm going to "work 'it' out" tonight. I still think that she find it a little sili, though.
With regards to the guy who thought that your wife/girlfriend said she didn't want you to Penis Enlargement because she deep down inside wanted you to do it: that does not make sense to me at all. If she had a desire for it, and you suggested it, she would absolutely not say that you shouldnt do it.
My suggestion is to let her know that you do it; that you're doing it because it is something you want to do (and not because you think it is something she wants), and to give it time. Once she sees that it isn't dangerous, or that you become some sort of pervo because of it, shell lighten up. I am very happy I told my wife. I wouldn't want to go around hiding away. Plus, we've had some very interesting discussions on size after I told her...