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LW, you are not a slut! Do not let some guy convince you that you are! As long as you feel comfortable with what you've done, there is nothing wrong with it. As far as I'm concerned, respecting one's body means doing things for the right reasons. If you had the threesome because you thought it was the only way you could be liked by the people involved, that is disrespectful to your body. If you had the threesome because you genuinely wanted to, there is absolutely nothing wrong with it.
I think we need to take the entire concept of slut out of the picture. Despite the fact that one poster did mention the "male slut", slut is overwhelmingly a way to put women down for their sexual behavior. There is nothing wrong with women enjoying sex and having as much of it as they desire. There is nothing wrong with having multiple sex partners or having sex that isn't "sacred" with someone you aren't passionately in love with. Men aren't condemned for this behavior, and women shouldn't be either. The word slut implies that they should, and it needs to go.
And, by the way, it is possible to find men who enjoy women with healthy sexual appetites and who are comfortable with the idea of their partners having sexual pasts. They are called mature men without sexual hang-ups.