Not quite the same as rubbing things on your bump but it does relate to bonding with the bump etc....
I've just bought a Mexican bola necklace. It's like a charm that has a little bell in it, the length of the necklace means it hangs at the top of the bump - the jingling is supposed to be soothing for bubs and if you continue to wear it when your little one has arrived, the sound is relaxing for them as it reminds them of being in the womb, I love it!! They're also called angel charms or angel sounds
Just thought I'd share!!
Xx