What do people get out of watching gory sexual films?(NSFW I suppose)

Just a while ago I noticed a channel on Youtube I subscribe to had a trailer up for Piranha 3DD and frankly, I find it sorta despicable. It may be me being over the top or part of my puritan conservative upbringing momentarily kicking in, but I really find it decadent and draw parallels to some of the things done in the amphitheaters of the Roman Empire. Yeah, I know, it’s not real, but people still are being entertained by gore, sex, and death (technically making it a snuffish film) intermingled into one play which is similar to some of the things done back in Rome. Is this just a natural pleasure of man?

And besides, what does one get out of DD’s getting eaten? These magnificent beautiful pair of globes (which are one of the few things that get me to even momentarily consider the existence of a higher being) being mauled and marred?