Most Helpful Guy
One thing you need to realize is that guys who have sex a lot don't settle down for the 'right girl'. They settle down when they want to settle down, and at that point they look for the right girl, which they probably consider a 'good girl'. They tend to have low expectations of women around cheating, so prefer a less promiscuous girl who is enthusiastic with them. Basically, they're choosy.
Most Helpful Girl
They either ignore those girls or think about those girls as their possessions if they were to ever form a relationship with that girl. In the end, they won't care about her for what she's as a person overall but for their own needs, to satisfy their own sick ego.