The fields of sexual health and sexual pleasure are entwining as the adult novelty business continues to grow. The global sexual wellness market, which includes everything from condoms and lingerie to sex toys, is currently worth around $16 billion and expected to reach $21 billion by 2019, according to research firm Technavio.

Now, manufacturers are looking beyond simple stimulation devices; wearables are gaining traction, though they're a bit different than the wristbands so many people associate with wearable tech.

OhMiBod's Krush, due out this spring at a price of $75, is a device women can insert vaginally to help strengthen their pelvic muscles. And as a "reward" of sorts for completing exercises, the system has vibration patterns that allow it to also be used as a pleasure device.