I remember seeing the trailer for this film before it came out, and it's very striking. It seemed funny, but kind of scary, and that's indeed what this film is.
I think the casting for this is great, because a lot of guys in this world seem so friendly, but hide this darkness. Most abstain from the evil that runs through their minds, but a few give in.
The stark image mirroring reality is a hard thing to stomach, as you watch this movie, especially near the end, but director/writer Emerald Fennell is phenomenal, and shows us a character who chooses to divert the plans of rapists using herself as the bait.
Mulligan plays the character well, showing the unexpected emotions that pop up when she develops feelings for the Bo Burnham character. As the plot progresses, ups and downs and multiple events happen that make this a roller coaster, with a smirk of dark humor ingrained in the final product. It's a hard film to sit through, because we know who's lurking outside the theater, in the real world.
I recommend this for adults, who can take a little chocolate and whip cream on their poison. (Dark comedy and thriller fans.)
