i think it differs for everybody, some people can separate love and sex and it's normal for them, and it doesn't affect them
but i rarely can have sex without love, or some feelings, maybe if it was spur od the moment and i get that "short feeling of being in love" kind of thing if you know what i mean. a guy that interests you a lot for only a few days and then you forget about him.
i've discovered i can barely get wet if i don't have any feelings for a guy, i just don't have any interest in sex with him either. (sorry if this was to graphic for some lol)
but you seem depressed, honestly. leave your loveless relationship, and seek professional help. i think love will come eventually if you get yourself together (●'◡'●)ﾉ
You know.. sex without love is very terrible. It doesn't feel good at all, and sometimes you'll feel disgusting. A lot of sex without love will make you lose interest in sex and finally you'll become frigid (for a woman) or have erectile disfunction (for man). But the worst is psychologically. You'll be very depressed. And it is not a joke at that state. After that, you'll wonder, if true love is really exist. What's love anyway? Why is it so difficult to maintain? It was fiery and wild at first time, but after a long time, it wilted. After that, you'll feel this terrible hunger "to be loved and loving somebody".