That's awesome that he didn't just shut you down on it. I had to carefully approach my H with it (he would resist me trying to "label" what's going on.) My H is very used to women from his past (because he chose very controlling women) trying to tell him he was "wrong" or things were all his fault. I couldn't have given him an article and said what you did, I had to finesse the situation more.
As for him trying to "help the girls get out of their situation", well...that's just bull. He sought out escorts and saw them on a regular basis...he used them, just as they used him for money. Plain and simple. If he wanted to help them out of the situation, he wouldn't have needed to use their services to do so...right? Anyway...that's in the past.
You bring up an interesting point I hadn't touched on about him being raised by a cold distant mother. My H was raised by a really great set of parents BUT, the NEVER show affection in front of anyone....not physical affection of any kind. No hugging, kissing, pats on the but, I Love You's...nothing like that. It's obvious by being around them that they do love each other and show it in other ways (they banter all the time), but nothing at all like you would expect from a loving couple. My MIL also likes to act like she's VERY naieve (she's not). She will change the channle if someone so much as says a cuss word...or if a woman comes on the screen in a bra/panties. So she has always made it seem as though...sex is something #1 not to be talked about, and #2 that the type of woman you would marry would not appreciate it. She's a good woman, but honestly, she set a bad role model for him in this way...completely unintentionally.
As a result my H has made some bad choices when it comes to women in his past. Those women helped to reinforce that respectful women don't like sex. The interesting thing is...I'm very certain at least two of his significant relatinships cheated on him. I know his 1st wife did, he came home early (after working three jobs to support her while she stayed home), to find her screwing another man on their living room floor. I'm pretty sure his wife prior to me did as well (yes, he's been married a few times, but looks like this is the last one for us both.) I found out from his mother in talking about things (she confided in me about his XW prior to me) that she took another man on a cruise...blatantly...wouldn't allow my H to go on the cruise with her...and took someone else, another man...with her. She also withheld sex, my own MIL overhheard her tell him "either you do as I say or you won't be getting any, I don't need it..."I" can be a sexual camel." Well apparently she wasn't...she just got it elsewhere.
So my major hurdle with my H was to get him to trust that I'm not like these women. I'm not out to hurt/control him. Just the other day he came to me and said "why couldn't I have met you twenty years ago?!" To which I respond now, "because you couldn't have appreciated me back then."