Can you describe a sexy female voice?

I've been seeing this guy for a while, but we usually don't talk on the phone because I hate talking over the phone. We just started talking over the phone recently, but today when we were talking I was just super tired and I kept dozing off mid conversation. Finally he just interrupted and said, "Your voice sounds so sexy when you're tired." I didn't know voices could be sexy.
Can you describe a sexy female voice?
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