I know a friendly storeman. Let's call him Dave (because that's his real name). He tells me that if you fill RAF gloves with swarfega (again, ruthlessly pillaged at the poor taxpayer's expense) and abuse yourself, it feels just like someone/something else is doing the deed.
I had to tear myself away from a very boozy 3 hour lunch break to bring you this information. Lucky I wasn't at my desk or I may have sicked up on it.
Hope this helps.