Double Subverted: Another sex scene happens, which is described this way.
Alice and Bob are literally shown assembling an IKEA product, and have orgasmic reactions.
The blandness is taken to ridiculous extremes and their dirty talk becomes Beige Prose, 'move your body against me faster' and 'I am feeling highly aroused'.
They have blandly described sex in an actual IKEA store.
Bob and Alice's sex life is so boring that Charlie thinks they're assembling IKEA furniture just because the narration of the scene is just that boring and then he falls asleep.
Zig Zagged: The description is so bland they might be putting furniture together. And they are putting furniture together. Because their fetish is furniture assembly. But they're both incredibly bored with it and it's mechanical to them.
Averted: The sex scene is described reasonably and in detail.
Enforced: "We're running out of ways to appeal to the Lowest Common Denominator. Let's put in a sex scene and describe it as, 'They had sex'."
"What's with all the erotica which is written as 'They had sex'?"
"You know, I bet that felt a lot better than it could be described."
Invoked: The writer wants to show that Alice and Bob find the sex incredibly boring and passionless.
Defied: Alice stops, says that she doesn't want the sex to be bland and boring, and puts on soft music and mood lighting.
Deconstructed: The dry description of the sex scene is actually what's going on in Alice's mind. She finds the act so dull and emotionally uninvolving that it amounts to nothing more than the physical action of "in, out, repeat."
Reconstructed: The dryness of the scene is an alien and/or robot describing to Alice what it thinks sex is like for humans. Then Alice talks to the alien so that it can understand the importance and emotional impact of sex to humans, and the alien learns more about humanity in a touching moment.