I've never changed. I have always loved eating my wife's pussy, and still do. Before sex, during sex, after sex....all the time. I do it almost everytime we get in a pile! ;)
Her's changed though. At first, no way would she do oral on me. Then she would, but no way she would let me cum in her mouth. And then, she decided to give it a go in a hot and horny moment. Must not of been so bad, since she started doing it all the time. Before sex, after sex, and all the time!
:)