It reminds me of Counterpart, another show that played around with multiple and split identity, although in a completely different idiom. Counterpart is ultra-realist, shot on location in a grimy Berlin, and aside from the conceit of two split worlds, everything is as normal as can be, at least, normal for a spy thriller. Severence on the other hand exaggerates every visual element, the corporate office is cartoonishly bland, like some archtype of an office settting with no extraneous detail, everything clearly planned by some evil visionary.
Combines spy and science-fiction genres. A lot more in the spy direction actually. It's 4 parts LeCarre (lots of gritty Berlin atmospherics), one part SF-identity-munging a la Orphan Black
Really good performance by J K Simmons playing two different versions of the same person. [not really a spolier, that's the premise].
Although Kyle McLaughlin got him beat playing 3-4 different versions of Dale Cooper on the Twin Peaks 3rd season.
"The Spy Who Came In From the Multiverse"
Some hot sex scenes, but none where the person makes it with their counterpart. Maybe that was too much for the vfx budget. If that's your kink, I recommend the classic time-travel / narcisssism book The Man Who Folded Himself by David Gerrold