Pen Test Partners’ investigation of modern smart sex toys has revealed how exposed most IoT devices running BLE (Bluetooth Low Energy) really are. The problem is that BLE has fewer security features compared to classic Bluetooth, and when [BLE security] is implemented it s often done poorly, experts say. Some devices have been so poorly designed that they have the same identifier which they broadcast to nearby users looking to pair up. An attacker could drive around a city with a powerful antenna and map out all sex toys.
Source: https://www.bleepingcomputer.com/news/security/leave-it-to-sex-toy-flaws-to-show-the-sad-state-of-bluetooth-le-implementations/