I'm not particularly freaking out over it friend, I just wouldn't go out with a girl who does sex work. It's not that deep.
I was confused where he got that from in your tone. You made it pretty obvious it's your own opinion. And one that is fairly common too. MOST people wouldn't date former prostitutes, let alone someone actively doing it.
Personally I couldn't see myself coming home from my normal work, then kissing my girlfriend knowing she's been sucking dicks and licking random guys asses a few hours prior.