Stimulation needs to cease once orgasm is achieved. So a cavity could never be a sex organ because it can always be penetrated.
![Stimulation needs to cease once orgasm is achieved. So a cavity could… Stimulation needs to cease once orgasm is achieved. So a cavity could…](https://nosper.com/wp-content/uploads/quotes/PGY/Icons/Cock_A.jpg)
Stimulation needs to cease once orgasm is achieved. So a cavity could never be a sex organ because it can always be penetrated.