Why dating a woman that slept with many men doesn't concern you ?

It should concern you as a man especially if you are considering marriage. Women who have had more than 1 sexual partner are more likely to divorce and be disatisfied in marriage. The more sexual partners a woman has the higher their disatisfaction and rate of divorce. Also every women a man has slept with has some of his DNA in her (this is a biological fact) that is why women who have slept around before when they have a baby with their current partner their child looks like a previous lover because that DNA is still in her. This is not even mentioning spiritual consequence such as soul ties and absorbing some of the triats of previous lovers.