Meh, I honestly don't see what the big deal is. I've never had a problem with "the question", I tell her the truth and expect it in return. The past is the past, but I like to know where my partner is coming from experience wise. I also have no problem talking about past encounters either. If you trust someone, then this topic shouldn't be taboo or off limits.
Who cares if she's been with one or one hundred, if I like her before the convresation then I'll like her afterwards. If she is inexperienced then I'll teach her a thing or two, and I've had women who have definately taught me a thing or two.
People make mountains out of molehills sometimes, think about what really matters in life...