Am I a man whore?

Last night, I had a third "date" with a woman I have been seeing for the past week or so (I have known her for a while through friends beforehand). It had been going really well - the sex was fantastic and we seemed super compatible, and I was looking forward to being involved with her for a while. We came from really different backgrounds which always gave us something to talk about, but we always seemed to be on the level with each other and would keep surprising each other. She's older than me at 28 (I'm 24), and has had quite a wild life, so I assumed she had been with a lot more partners than I.

Long story short, we're chatting about some past relationships and she mentions jokingly that I'm a man whore for being with so many chicks. I really don't think I am, and actually think I'm pretty picky when it comes to girls, so she asks me how many girls I've been with in the last 2 years. I answer honestly, six, two of which were girls I was seriously dating, two of which were one-night hookups, and the other two friends with benefits kind of arrangements that weren't event regular.