According to palmistry, you can identify such people. There are lines that show the number of relationships that you have in your life.
Palm readers can tell all about anyone's past and present relations by looking at the marriage line. These lines start at the mount of mercury (area below the little finger). These are vertical lines that usually start at the beginning of the mount of mercury.
According to astrologers, more than one line indicates that the person has the same number of affairs as the number of lines there. If these lines are broken then there are chances of divorces.
These lines can also predict your happy married life. If these lines run downwards then you may face a lot of problems in your married life.
Note: Palm readers study both palms properly before they predict anything. There are many small lines that can nullify the effect of other lines.