NOW, They don't offer the possibility to use their OLD Design ....
Since May 2018, Xhamster want we use its MEW design and force it at each time we refresh it after a long time.
This userscript try to Stay in Old Design by only auto clicking on the switch button (author of the Library in use: Brock Adams).
It's not so fast but work....
Better approach with this script:"xHamster Auto Old Design" by Phlegomatic
"To clarify, with this method it's still "slow" to switch, however, xhamster shouldn't constantly switch back to the new design anymore, due to the cookie reset to expire 5 years from last visit. So if this works, it's only slow once"