Why would a Guy ask when the last time I had sex was?

LovelyBones13
Coworker. I had a crush on him. He had/has a girlfriend so i never expressed it. We became friends, good friends. Now i am a bit oppenly crushing on a new single coworker. He teases me with that. Says he smells the pheromones.
Now today we were working, talking, joking etc. He said at one point blunt and with nothing related to the previous subject (i was saying i dont like to be told i am not good at something at the job) and then he asked; how long had it been since you had sex?
I couldnt reply and he didn't mentioned it later on
Why would a Guy ask when the last time I had sex was?
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