“But the bottom line is, if you don’t want to get attached to somebody, it’s easier to not sleep with them . . . Because you might end up being attached to somebody who really does not fit into your life.” ~ Dr. Helen Fisher, “This is Your Brain on Sex“
Having sex releases a flood of oxytocin and vasopressin in the brain. These are the same chemicals that give a mother the feeling of attachment to her newborn. It would seem we are wired to feel attached to the people we sleep with.
And so it may be that there is no such thing as casual sex. Proceed with caution.