Not really a shocker at an event for ‘Fifty Shades of Grey’…but it’s still gross nonetheless.

This couple was busted after getting it on in multiple spots throughout this museum in Vegas. (I guess they don’t call it ‘Sin City’ for nothing.)

They thought no one was watching, but forgot about security cameras.

According to TMZ, who obtained the video surveillance clip, “First, they found a hiding spot and waited for the museum staff to clear out … and the house lights to go down. Then the banging began in earnest. The couple didn’t hold back as they moved around — but they didn’t realize security was watching.”

You can watch the video here.