I agree with Fylimar that the scene with Haarlep
doesn't seem consensual. Haarlep doesn't warn the player of the consequences of sex with him, so it certainly isn't informed consent.

I don't have PTSD, but I still appreciate trigger warnings. I once had a forensic psychology class, and it would have been extremely hard to get through if I didn't get advanced warnings for which days would have particularly tough content.

Anska's points about tags makes sense to me. Tags wouldn't be immersion breaking or only accessible after purchase, and would be easy to avoid if a player didn't want spoilers. It also would allow more specific warnings, since extremely vague warnings aren't very helpful.