Well, if the guy asked he should be prepared to know the truth. The bigger issue is why this is important to him in the first place, and why he thinks you're "used up" because you had a certain kinda sex with someone a bit over once a month. I'll keep my own analysis of his likely motivations to myself, but that is really what you ought to think and be concerned about in someone who you are clearly emotionally invested in. But the yellow lights are flashing, bro, the sirens and red ones may not be far behind!!