The principle is that, if the salesperson had just said "yes," then the conversation dynamic just kind of dies there, whereas if you say "Would you LIKE it in red?" then the CUSTOMER has to say "Yes", and they're much closer to owning it.
It INVOLVES them more.
So my suggestion the next time your wife says something about "Are you trying to win me back?" to say
"Would you like me to try and win you back?"
Choc., who's pretty good at sales, but pretty sukky at this whole Marriage thing...