To depict intense sex through moaning sounds, consider these approaches:

1. Varying Pitch and Intensity: Moaning isn't a single, monotonous sound. Start with a low, guttural moan, building in intensity and pitch as the scene progresses. Think of a crescendo, reaching high-pitched cries at moments of peak pleasure. Then, allow the sounds to subside, perhaps to a low, breathy whisper as the intensity wanes. Consider using onomatopoeia like "Mmm," "Ahh," "Ooh," "Ugh," but don't overuse them. Instead, use descriptive words to enhance the effect.

2. Incorporating Breath and Gasps: Moaning is often intertwined with breathing. Describe ragged breaths, sharp intakes of air, and gasps for air between moans. This adds realism and emphasizes the physical exertion involved. For example, "She gasped, a sharp intake of breath before a low, drawn-out moan escaped her lips." or "His breath hitched, a strangled cry escaping him as he arched his back."

3. Using Sensory Details: Don't just describe the sounds; describe the accompanying physical sensations. Mention trembling, flushed skin, sweat, or the way muscles tense and relax. This creates a more immersive and visceral experience for the reader. For example, "Her moans were punctuated by tremors that ran through her body, each sound a testament to the overwhelming pleasure."

4. Employing Figurative Language: Metaphors and similes can add depth and nuance to your descriptions. Compare the moans to the sounds of animals, instruments, or natural phenomena. For example, "Her moans were like the mournful cry of a whale, deep and resonant," or "His cries were like the shattering of glass, sharp and sudden."

5. Considering the Context: The type of moaning will vary depending on the characters and the situation. A dominant character might have more forceful, commanding moans, while a submissive character might have softer, more vulnerable sounds. Consider the power dynamics and the emotional state of the characters.

6. Show, Don't Tell: Instead of simply stating "She moaned," show the reader the moan through vivid descriptions. For example, instead of writing "She moaned in pleasure," try "A low, throaty sound escaped her lips, building in intensity until it became a breathless cry."

7. Avoid Clichés: Overused phrases like "she moaned ecstatically" can feel stale and uninspired. Strive for originality and creativity in your descriptions.

8. Balance and Pacing: Don't overdo the moaning sounds. Too much description can become overwhelming and detract from the overall narrative. Use them strategically to highlight key moments of intensity and emotion.

9. Read Aloud: Once you've written your descriptions, read them aloud to yourself. This will help you identify any awkward phrasing or inconsistencies in the sounds.

10. Seek Feedback: Share your writing with a trusted reader and ask for their feedback on the effectiveness of your moaning descriptions.

By combining these techniques, you can create realistic and evocative descriptions of intense sexual moaning that enhance your storytelling without being gratuitous or overly explicit. Remember to always consider your target audience and the overall tone of your work.