Assstronouts in Space

I have like 50 different versions of this premise but it's basically:

• A collection of humans join a collection of aliens on their space ship on a diplomatic mission to visit their home base called The Nucleus, an alien-made planet that is a chaotic collection of tubes, corridors, habitats, and alien districts, all fused together. (inspired by Valerian and the City of a Thousand Planets (2017))
• The journey is a long (spanning 3-5 years), the aliens are horny and shenanigans ensue. With the humans either being in on the joke or not.
• May or may not mention the infertility crisis the aliens are experiencing back home.