How should I answer this question about sex partners?

I was just watching a movie and this was a topic of discussion in the film.
The woman had a much higher number of former sex partners than her husband and he seemed pissed about that.
I was faithful to my ex since I was 21 so there’s only 4 people I was with before her and I was a teenager then so it was just drunken, half-assed awkward sexual experiences, the kind you have at highschool parties.
My ex had been with 6 before me and probably cheated with 2 or 3 while we lived together at the end of our marriage.
Anyway as a guy with only 5 total and 15 years with the same partner if a woman I’m dating ask’s how many women I’ve slept with should I just say “All of them, but you’re the best and that’s why I love you” or just tell the truth and cringe when she says her number’s like 15 or 20 because she was single in her 20s?
That’s an awkward conversation.