I used to drink in a wonderful wine bar (they sold excellent real ale as well) which was run by two gay fellows. They used to mix some of the drinks with a vibrator - they swore that that was all that it had ever been used for - I was always thankful that beer doesn't need mixing ! The entertainment of the evening was provided when the two guys had a tiff (it happened every night - it had to be planned), I've never known any woman who could be as amusingly catty as they could.
Back in the 60s, a friend of mine bought one of the early battery-powered cassette recorders. I had a similiar one and got much more life out of the batteries than he did. He returned it to the shop several times, but they said that there was nothing wrong with it. One day when he changed the batteries, he notice that two of them were a different make. It turned out that his student girl friend, who got home much earlier than he did, used to pleasure herself with a vibrator (which my friend had bought her) and when she used up the batteries in it, she swapped them with the ones in his cassette recorder ! I found a small mains transformer unit for her vibrator which solved the problem, although we did wonder if a "Kango" hammer with a rubber end might have been more suitable !
Incidently girls, if "size doesn't matter" why are dildos/vibrators usually so big ?