Infidelity can have a whole bunch of different definitions because some couples may have different ideas of what constitutes infidelity.
For example, a person may not want his or her partner flirting with anyone else to flir to them is considered infidelity.
Some people may be confortable with their partner having only oral sex, or may allow them sexual intercourse with others, or something in between.
A person who is identifies as heterosexual may accept his or her partner engaging in homosexual but not heterosexual acts with others.
because of all these factors, infidelity is now exactly a simple subject
