That is how I was raised to value sex or love-making. Some might see it as something that just fulfills their physical needs. If one person sees it as sharing a special bond between two people who love each other emotionally and one sees it as pure physical enjoyment for the moment then it is probably immoral. The reason it would be immoral is because the people are obviously not communicating and are using each other for different reasons. So, if two people go to a bar to find sex and they find each other then let them go.
Sex is something that is shared between two people for whatever reason.