From a medical/psychological standpoint, physical attraction/intimacy is just as important as the emotional stuff. It's best to maintain a balance between the two sides - not that a relationship based on only sex or only love couldn't last, it really depends on the people involved.
And sex isn't just a "filler" for everyone either - sure, there are people who are in fact "sexaholics" - but that's like saying that everyone who has a beer or two with a meal on occasion is an alcoholic.
Really, it's the same as anything else in life. Some people shop to escape problems, some people eat, some people have sex, etc. Sex itself is not the problem - a mentally/emotionally stable human being doesn't need a reason to have sex, aside from the desire to be with the person they're having it with.
And sex isn't just a "filler" for everyone either - sure, there are people who are in fact "sexaholics" - but that's like saying that everyone who has a beer or two with a meal on occasion is an alcoholic.
Really, it's the same as anything else in life. Some people shop to escape problems, some people eat, some people have sex, etc. Sex itself is not the problem - a mentally/emotionally stable human being doesn't need a reason to have sex, aside from the desire to be with the person they're having it with.