Play Chicka is a porn magazine for women. The men picture are either partial nude or fully nude. Bulla's friends, Koakuma and Miricle exposed her to these magazines.
Places like Victoria's Success and Ladies Night Out sell these magazines everywhere, even some guys are willing to buy this. It also has its own website so you can subscribe and order magazines. The company is strict about who they hire. Several companies (including Capsule Corp) sponsor this company, even Central City's treasury sponsors this.