Jeff would say they leave for a career in drug addiction .

I would assume some go into some other line of sex work like stripping or escorting. Some go back to school. I'll bet a lot end up as cocktail waitresses, though I have no data to back that up. A few get married, etc.
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"All my years in p*rn didn't quite prepare me for childbirth. I mistakenly thought all the stretching I did would make this easier."