Do you engage in casual sexual relationships? Why?
Yes, because is one of the great pleasures of being alive, It's a physical way in connecting and experiencing life.
Casual as in a non-attachment and non-emotional? Physical contact is not emotional contact. Sex is satisfying a physical urge. like eating to satisfy your hunger for food.
Are you going to tell me that you need love to have sex? Will, what happens to that love when you can't perform physically any longer?
If you are fortunate to have good food, good conversation, good friends, good music, good health and good sex that makes for a good life. Good being subjective of course.
It doesn't matter if you are lonely or not, feeling lonely is a state of mind not a physical state such as being a lone, by one self, physical isolation.
The question is whether you enjoy sex...or not?