How do I find out if she's telling the truth?

This is going to sound really ridiculous but it really matters to me not because it matters, but because I don't like being lied to. I've been seeing this girl now for about 6 months and we're waiting until we're married to have intercourse. I remember one day as we were talking about it, she brought up some prior experiences that she's had and she told me that she never gave anyone oral before.

Ever since then she said that it's been spiraling through my mind.. How do I find out if she's telling the truth or not? Is there a way for me to ask again without asking outright? I know it sounds silly but I just really want to know. It's really bugging me. Thanks for taking the time to read this message and have a great day.

How do I find out if she's telling the truth?
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