"That's MY business" comes to mind first. One does not have to Justify ones History. That is to be shared with those one is comfortable with.
My First was a Rape, so as I was Penetrated, I wasn't a Virgin after that, so counting it as Zero would be inaccurate. I've had a number of partners since, some were Consensual, and some were Forced. Regardless, I am the Person I am today, not a Baseball Card!
You can use, "I've taken 1 Partner, and was Forced by another", or some similar
Hugs!