SPOILER ALERT: I saw the 96% Rotten tomato review and thought that it might be good but was disappointed.
The thrust of the movie was that life is all about sex and beauty. Thus, when this old woman lost her attractiveness but still had this crazy sex drive but nobody to satisfy it (her husband had a bad heart), she got extraordinarily jealous and envious and killed the young who still had lots of sex. Her 90+ year-old husband hated his 90+ year-old wife trying to sleep around so he, too, participated in the killing.
It is just a movie about our modern objectification of women's sole worth as sex objects and sex and attractiveness being the primary value in society (and perhaps it is the one true value in Hollywood). I think the writer was trying to be profound, which was awkward. Another awkward part was when the 19-year-old sound assistant could not help but want to be a pornstar after watching and helping to film two late 30+ year-old aspiring pornstars having sex. So the teenager insisted on being filmed having sex with this well hung black pornstar in his late 30s. I'm sure that happens all the time--young attractive female teenagers just wanting people nearly twice their age for sex. Then, I thought that Wayne might want to have sex with the old killer lady who is twice his age, but then I remembered that this was a Hollywood movie--that will never happen. LOL
Sex is a very powerful desire, but I think that the script writer needs to spend more time with older adults and less time with horny, sex crazed teenagers or very young adults--and pornography culture.
The acting, however, was pretty good.