I have yet to meet a guy who isn't über sensitive about his "size" no matter how big he is.
Dare to crack a c*ck joke or make a comment that in any way could be interpreted as saying his manhood is small, and you'll get nastiness, sulking, and/or acting butt hurt.
But it's ok for guys to want their women to get fake implants that can cause all sorts of medical problems.
Is that really caring about your partner?
"Hey honey, you need bigger boobs. I know they can cause all sorts of medical problems but it's more important for you to stay hot so I can get my jollies off".
Good lord.
Tell him his cock is so small that the sex isn't good and he needs an implant down there. Yeah it would probably be the end of the relationship but if it were me, the relationship would have been over with that implant comment.
Oh but I want to add that every guy I've been with prefers the real thing. No matter what the size.