The post is by Patur, mods.
At first I didn’t realize why you pointed this out but then I remembered:
Anyway, as to the substance of your critique:
The way the sentence was written, it means that girls are dating pictures as opposed to dating boys. Then I suggested that “dating” could be an adjective modifying “pictures” by which I meant that it would be saying that having pictures of girls dating (i.e. a picture of, a girl on a date) would help. Which actually would only make sense if there was an apostrophe. If that’s what you meant, then you are correct. Unless I decide to make this another exception to apostrophe rules (need I link the reference?). When I said that taking out the word “dating” would help, I was subject to the same apostrophe issue. If not for that though, the statement would work.