If you asked your SO to do something for you, does it make it less special when they do? (i.e. you mention they haven't brought you flowers in a while and they bring you some the next day.)
Same question in reverse.
Random question - have you ever been asked to pick up some-one's mail and feed their fish etc. for them and you ended up having sex in their house with your SO? Do you feel guilty about it? Is there anywhere specifically in their house you would not have sex if you were to do it?