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.
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.
i personally am not one but i know many promiscuous guys, they are guys that want to try every girl out and see how it feels and if they have their eyes on you they try it and try get you to do some drugs with them (happy drugs) however if your the opposite they probably just ignore you unless they want you.
They'll ignore them before they are ready to settle down and when they want to settle down with a woman they'll actively seek these women out. It's like how a woman behaves, she wants a safe man to settle down.
I don't judge girls based on how many partners they've had or if they imbibe in drugs. I actually prefer girls who abstain because I'm into living a healthy lifestyle. I'm a very physical person and I love sex, so if I like a girl I'll try to connect with her and get pussy. I love good girls, girls who are sweet and kind and generally responsible people. They usually make great gfs and sex partners because they're caring.