IMHO, if you want to kiss your wife, just kiss your wife, don't tell her you want to kiss her and then put the entire burden of what to do next or finding the right thing to say on her shoulders. ___________________________________________________________
In my case, we were laying in bed before turning the light out for sleeping. I put my arm around her and told her to come close because I wanted to kiss her. I didn't pose it in the form of a question requiring some type of response from her, but I can see how perhaps that may make her feel awkward if she did NOT feel like kissing me (for whatever reason).