The only thing I disagree with is that you omit to mention enjoyment, and while it is probably close to 100% certain that a male will always continue to enjoy sex (physical ailment notwithstanding), it is not -- I think -- 100% certain that he will continue to enjoy sex with prostitutes. There are a lot of reasons why this point might be reached; I won't go into them (most of us can guess). Anyway, I would say that it IS possible to reach a point where your desire to have PAID sex either disappears completely or dwindles to near zero. I have gone from a multi-punts a week situation maybe five years ago to perhaps a one punt a quarter situation now with no change in my economic or personal circumstances simply because paid sex gives me virtually no pleasure any more. And I can easily foresee that once a quarter punt becoming twice a year, or less. These days, I can have 200 quid in my pocket, a night with no obligations and all the opportunity in the world to punt. But I just don't. That NEVER used to be the case. So no, not once a punter always a punter, at least for me.