Your questions in the past have all been about cuckolding and you had asked a similar question about your wife wanting a bigger penis.
It seems to me that it is you who feels that your penis size is inadequate for your wife to have sexual satisfaction and orgasm. None of your earlier posts mentioned that your wife had four ex lovers and this seems to be your fantasy. You had however mentioned that she viewed porn and that it was there from where she got the idea. Just to remind you, about what you had told us.
There is no need to put the blame on your wife, if you are keen to have a session of cuckolding. We have in our past replies elaborated on what cuckolding involves and would like you to re-read those answers. Cuckolding has to come from your wife, as she needs to treat you like her slave and have sex with her mates in your presence.
Your penis size is adequate to please a woman, provided you concentrate on the art of love making and get your wife to orgasm even before you penetrate her vagina.