I don' think it's a bad thing. Usage can be really romantic and hot in my opinion. It doesn't mean to neglect her pleasure everytime or not have loving, caring and pleasureable sex. When he or she needs to have an release, wants to fuck or get it, but the other one isn't into having sex, they still give their bodys up to be used. To me that is so hot. To acknowledge their need and give in.
Fucked my wife for the the fourth time in the night today like this when she slept.. she was taken by surprise when i inserted my rock hard dick inside her. She moaned like hell. But gave her a nice deep fuck in that awesone pussy. Finisshed with cum down in her