WildTimes: Just some thoughts.... Does your wife still drop hints?
Option 1) Is your wife a talker during sex? If so, just plant a seed of how sexy she is along with other man have told you they desire her. They love to slide their cocks into your "Hot Pussy"
Option 2) After some drinks watch some porn where other men are fucking a wife.... Then mention the above and sense her reaction..... The "Pussy Wet Test" always surfaces what your wife's inner thoughts are saying....even if she doesn't vocalize them.
Now the "Cock Test"....... when you think about another man's cock sliding into your wife's pussy, how hard does your cock get?
Hope that helps....