Well I do agree there is a difference in the present or past tense usage of the word. For example:
She/He is a slut.
and
She/He was a slut
Although similar those sentences have distinctly different meanings. Yet no matter how you cut it those meanings are not complimentary. Nor, IMO, should they be. Being monagamous is considered a virtue and virtues are the overcoming of temptations. Being virtueous in any area is not considered to be an easy task. It is a trait to aspire to and a trait to be respected. No matter how you spin it, our choices in life define us. This is not to say we can not change or evolve, we must, for such is the way of life. But we cannot change are past actions, they are written in stone, these we are accountable for. Our past is something we must live with and it is for others to accept that part of us or not. Some may not. Right or wrong, this is just a fact of life.