True story... The first time I ever visited the flat of my most recent ex-girlfriend's, I happened to spot on her mantelpiece a candle in a holder that had a distinct curve to it. I seem to remember mentioning it at the time, but didn't get a cohesive response. However, a couple of months later she admitted to me the reason it had a curve was that she had used it to have a wank one day and it apparently got warm enough to bend slightly!
This got me thinking about the best objects any of us has used to get off. My suspicion is that there are more houehold objects that would suit female use rather than male, but would be curious to know.
For my part, I will admit to trying the loaf of bread trick and it was just about OK, but nothing special.