One night stands tend to be different, there maybe not any intentional malice or premeditated thoughts or deliberate lying but an affair for both sexes is a different kettle of fish.
Very planned and very deceitful, this is where lack of empathy and concience comes into play for both sexes. The character of these individuals is shown and forever marked down just as a thief is characterized as that.
It's an unfortunate tag but no ammount of blame shifting alters the reality of the crime, for both sexes.
If you believe an affair to be a crime, some do, some don't.
It depends on your own belief systems, what contrues as an injustice, what is considered a crime.
An affair is not a legal crime, but many believe it is a moral crime, others do not think it is a moral crime if they are involved in such behaviour but most would not like the same moral crime to happen to them.
The actions within an affair, the abuse that naturally occurs in most affairs are considered to be criminal.
If you are the type to ignor abuse and the pain of others then you are a strong candidate for an affair, male or female.
Affairs are the furthest thing from love.
Love for marriage, children and for your fellow man.