True, but you know there was a case somewhere where the woman took the used condom after the couple had sex and used it to impregnate herself...and she admitted to it, and he STILL had to pay support. Absurd.
So there's another way it could happen.
Even worse, a ROOMATE could potentially access sperm from a used condom, and the guy could end up paying CS when he never even had sex with the mother at all!
I swear, if I were a guy, I'd be inclined to freeze a bunch of batches, and then get fixed. That would make it less likely for someone to get my sperm if I didn't want them to!