I wouldn’t describe as “selling your body” but it is using your body for a service. It’s not being damaged or losing value though.
Thats where I completely disagree. There is a big emotional and psychological toll to be used by another person for money. Yeah, in 20 years your knees might be in better shape than a factory worker, but your emotions, your self esteem, your mental health will not be. The knees can be fixed with surgery. How do you fix crippled mental health? There are people who spend their lives in therapy because mommy yelled at them a lot when they were young. You think someone who has been used over and over by other people for their own pleasure is going to be in better shape than that emotionally damaged person? Absolutely not. NO ONE comes out of sex work undamaged - its literally the price of participation.