I worked for a time in the special collections department of a university library. We were responsible for archives, rare books, and nudie magazines, all of which were kept in stacks restricted to staff only. Anyone wanting to see our materials had to produce ID and sign in. When I started working there I thought it was hilarious that they kept the porn with the antique tomes and personal papers of regional luminaries but it was explained to me that magazines like Playboy were stolen or valdalized the day they hit the shelves when they were openly available. it was either keep them locked up or cancel the subscriptions.
The university library where I worked as an undergrad had the Kama Sutra on permanent reserve because it kept getting stolen or vandalized. I worked several late night shifts at the reserve desk and had a huge crush on the hot grad student who came in all the time to pore over it and take notes.
More recently, I'm in charge of the Banned Books Week displays at my library. This past time we actually still had the Sports Illustrated swimsuit issue, so I put it in the display. It's the only item at our library that has ever been challenged while it was included in a display of banned and challenged material. Not even Baby Be-Bop has managed that, and I had it added to the library specifically in the hopes of picking a fight. The swimsuit issue went missing shortly after being challenged but retained. I'm pretty sure it wasn't a teenaged boy who took it, but of course have no proof.