Coworkers sleeping around

I work at a company where there’s always gossip and drama and bs happening. It’s like freaking TMZ up here. Well recently there’s been a lot of talk that a one of my coworkers has been sleeping with a ton of the other employees here, people with wives and kids and I know for a fact it’s true. She sleeps with the manager and it’s quite literally gross to even think about. I don’t know how she’s okay with being a home-wrecker but whatever. And it’s not just her, there’s others. Like what happened to keeping work separate from your personal life? This is an HR nightmare, too bad HR is also tied up in these relations and wouldn’t give a hoot. I’m so uncomfortable even being around anyone because of how disgustingly flirtatious they are. It’s to the point where I feel like my coworker is getting more pay and more benefits just because of these actions, whereas I work twice as hard and prefer to stay loyal and keep my life separate; this is just a job. Idk. It’s all just sickening and makes me want to throw up. Is this normal because I just want to quit and work alone