Also, one person mentioned so-called "lesbian sex" (presumably manual/oral simulation and/or digital penetration). Most lesbian couples I know are pretty happy, so you know, maybe they're onto something. 🤷

As others have mentioned, there's a whole world of physical intimacy beyond "place tab P into slot V."

(I'd make a joke about moving beyond the Victorians, but it turns out they were actually quite kinky when you look closer at the historical record.)