Can totally relate to your issue - my wife of 7 years had a few skeletons ( mens cocks ) in her closet and came about one night we were fucking and she sort of smirked and said she couldn’t feel me in her - long story short I suggested getting a guy with big cock and she agreed after me explaining I didn’t want other women and only wanted to see her satisfied and fulfilled . We even made an ad on pof and she was ok with that - UNTIL - I actually posted it and she went ballistic , told me she was only going along with it to see if I would go through with it and why would she want another man and sex was only between man and wife etc blah fucking blah . Up to that point I used to talk dirty when dildoing / vibing her mentioning guys names / work colleagues etc and this did really turn her on . Slow and measured never pushing it on her . I think your wife has exactly same mentality and even the porn thing was to make you feel comfortable and trick you into finding out exactly the kind of guy you are . I’ve been there too