You can read all the studies and do all the multiplying (of the number you're told) you want, but at the end of the day, there is no way for you to really know.

If partner count is something that bothers you (in an era and environmemt of sexual liberation), your best bet is to not commit.

That's TRP's perspective as well, hence the admonition against "using the red pill to chase blue pilled dreams" etc.