Is it very common?
I've been doing it for years, always has been my little secret when I have alone time, which is very rare now as I live with my Dp.
I believe it makes our sex life better as I can tell him what he needs to do, although he knows now.
It came up in conversation with a few girlfriends today. I could never tell a soul. We joke about 'rabbits' I daren't tell them I don't use one when its 'me' time.
Its normal to do this right?