I think that this depends on the two who are commencing in flirting. Typically flirting becomes serious ONLY and ONLY IF an emotional and or sexual compatability is formed; or some sort of attachment. If this occurs to one person and not the other, it can cause complications. There are some people who do not grasp a form of attatchment purely by flirting or by intimate acts such as sex. These people are impossible to deal with for the majority of society. I enjoy these sorts of people, vastly. In fact I may be included in this population.