Oh I totally understand that the looking good feeling good is not just for myself and that yes for some strange reason even though I am a happier person single, I still hold out hope that I will find another SO.
And in reality PM, I always want to maintain that feel good feeling, however, when with someone I and a lot of others tend to put their partners first and time together is important. That can cut into "feel good time" with working full time either with the family or job, somethings have got to give or you will find yourself just falling into bed every night exhausted and then even your sex life can suffer. Unless of course you get someone with the same love and can do these things together.
In my job within the gym industry, every single person is there for a reason...it all comes down to wanting to feel better about themselves. People from all walks of life and it is notable that many are unhappy in their relationships and come in to look and feel better. People are generally lonely and unhappy for various reasons.