It's always obvious when I lie, because I was raised to be honest by a very honest woman. And that's even with me having a theater background. For some reason, I could play a character, but I can't play a lie. I think I may have that same psychological block as you do.
And if I went from my experience, I've been lied to more panifully and dramatically by some men than women. And those lies did a great deal more harm to me than any lie a woman has told me.
Now, part of the problem could be what is interpreted as a lie. Women do tend to put a lot more nuance behind their words, so they can be saying something, and it's true, but it has an underlying meaning that isn't being said, but implied. That isn't necessarily a lie. It's just a more complex meaning behind a statement. To understand this better, there's a book called "Odd Girl Out." It's a great book in understanding not only how young girls bully each other, but how girls and women develop communication styles which are very different from the way men usually communicate, which can be more straightforward.
So ultimately, I think it's best to be careful about generalizations. And nobody likes to be accused of lying, so it can come across as offensive, especially if you're someone like me who is likely just as bad a liar as you are.
Wow, I'm really using my psych degree today in this thread!