pros: they already have erotic books and normal movies, stocking porn movies wouldn't be that different other than medium.
cons: idk something about child safety, and you'd have to make sure people couldn't access the porn videos actually at the library unless you were gonna go full hog and set up masturbation booths or some shit.
idk, i'm leaning on the pro side bc i can't think of a non-puritanical reason to allow erotic literature but NOT video porn.
Sounds like a bad idea but you do make me curious about the academic state of porn studies. Are there any universities that study the porn industry or consumer trends? Any peer reviewed journals?
porn researchers, like sex researchers generally, are out there. but they tend to be housed in lots of different departments (like film studies for porn, gender studies for sexuality, psychology & sociology for behavior and larger societal trends). within each of those departments, it can be difficult to find a job/funding/security because the topic is largely stigmatized by other researchers. they have journals as well, but they're not very well cited or respected, and so academics have to often change their topic to fit more prestigious journals otherwise they risk not getting tenured/evaluated poorly by their departments.
i had a friend working on a phd at a US uni with one of the highest rates of on-campus sexual assault. they wanted to test programs that were aimed at decreasing perpetrators' assaulting ppl (rather than making victims protect themselves). they struggled continuously to do the research, and while their work was well-received at conferences, they were so ridiculed and chastised by their supervisors and peers, they ended up quitting before graduating.