@Switch BlaydeI thought that "Slow" means there will be several chapters until the Action picks up; not just sexual content.
Such as Lord of the Rings, with multiple chapters of Bilbo preparing his birthday party, and leaving the Shire. Then Frodo and his preparations, and traveling with his friends...
Basically all of the chapters up until the meeting that forms the Fellowship of the Ring.
Many novels spend multiple chapters revealing the MC, or multiple characters, and "World Building" before the action begins.
For example The Longest Day spends a third of the book/Movie describing the Planning, and other preperations, before June 6th 1944.