A Texas-based manufacturer of men’s sexual enhancement products is on the defensive after many of the targets of its national litigation barrage against retailers of rival products decided to punch back, calling its settlement offers a “shakedown.”

Outlaw Laboratory seemed to have discovered a winning formula when it teamed up with a California law firm to file dozens of multidefendant lawsuits against convenience stores, gas stations and retailers around the country, asserting claims for false advertising over competing sex-drive products on the stores’ shelves.