The alternative makes less sense to me - who loses count of the amount of partners they had? It's one number to remember, I'd posit that the majority of people,

The alternative makes less sense to me - who loses count of the amount of partners they had? It's one number to remember, I'd posit that the majority of people, whether deliberately or not, do keep track of that. Calling them "stone-cold losers" for remembering a number doesn't make any sense to me.