[Hermann the Cherusker]

Is it wrong to kiss your wife passionately say, when you are exiting the car to go into a restaurant for a romantic dinner, or in the hall in the morning when you have to run to work but you want to connect?

A normal person would kiss his wife in these situations as an expression of love and would enjoy the pleasure of the kiss as something arising out of the expression of love.

To kiss ones wife to enjoy the pleasure of the kiss only is to turn the means into the end. Sexual pleasure is not a licit end in itself.