Unisex word (or short phrase) for "little black book"
Solution 1:
Where back in the 1970's somebody would call someone out of their little black book to arrange casual sex, nowadays you make a booty call to one of your your friends with benefits for a hook-up.
But in the post-AIDS era, it's unlikely somebody has so many f.w.b.'s that they need to keep a special list of them. And they probably keep their numbers on their smart phone along with all their other contacts, rather than in a paper booklet.