system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40k] As a human, if I get a girlfriend, will I certainly become corrupted by Slaanesh?

Exactly how dangerous? Is it like a maybe thing or do I need to be into some fucked up, kinky shit? If I am not overindulging, will I be fine? Will recreative sex lead in my soul being torn out of me, or is that just the eldar?

EDIT: Really loving the in universe first person answers. I'm already pretty decent on lore and understand slaanesh and that it's mainly overindulgence and greed, not sex like people prefer to portray.
gpt
You know how you sometimes want something even though it's bad for you? Like chocolate, maybe a lot of chocolate?

Slaanesh is all about overindulgence. It doesn't have to be sex. Some people seek adoration, some people seek wealth, some people pursue gluttony. It's all about the vices that matter to you.

And Slaanesh works by enabling you. Slaanesh favors those who indulge in what they want to begin with by enabling to go further. Are you an unrepentant homosexual even though your society or religion frowns on it? Slaanesh approves! Do you use your beauty to manipulate those around you into doing your bidding? Slaanesh approves. Are you a sucker for illicit drugs during work hours? Slaanesh approves.

And Slaanesh enables you, those who already seek indulgence find the favor or Slaanesh by enabling their favorite vices. You might get more attractive, more influential, your nervous system might make those drugs even more delicious.

And then the hammer falls. The sex isn't as good, the drugs aren't as mind blowing, the food isn't as tasty. You need more, better, you're getting desperate for a better high. Perhaps BDSM or rape is more fun, perhaps you should eat something forbidden, try those horse tranquilizers.

From there on it just escalates, every time you find a new pleasure, it soon turns to ashes in your mouth. You're getting more and more extreme. Children, barnyard animals and vacuum cleaners are no longer save. Are the cops trying to stop you from making a tasty quiche out of that pretty school girl? It's time for the 'ol ultra violence, how dare this boring plebs try and stop you from pursuing your hedonistic pilgrimage!

Slaanesh's realm is a heaven for his true devotees and a hell for his enemies. There's no real difference really but you'd simply have to be a true devotee to enjoy a place that is a torturous hell for anyone else.