I’m not certain that the AR sensitization/desensitization hypothesis has been scientifically debunked yet.
If what does happen is just up and down regulation of AR, perhaps it’s the changes of something beyond the receptors themselves that enables growth/sensitivity?
The message travelling through the telephone wire (DHT) —> Phone receiver (Receptor) —> The person (Some cell that responds)
Eg. in the case of a penis that is first starved of DHT, and then gets some:
1) Lack of food and an empty stomach (No DHT at receptor sites or penis cells)
2) Person eats food (DHT reintroduced to receptor sites and penis cells)
3) Person overindulges to quickly get rid of the feeling of starvation (The penis cells overreact by becoming hypersensitive/bigger