Actually you would be surprised how many sex workers are fucking without protection.
I am living in Germany and I can tell you that though it is forbidden by law since July 2017, it is practised regularly all over the country by all types of girls.
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All of you have too much imagination but also forgot what I have explained many times :

Mucus in throat are same as in ass and pussy ... so condom is useless if not used for blowjob too !!!

Mucus in throat?! As I said, what kind of sex workers don't use protection?