If it's the old-fashioned way, it'd be a logistical nightmare.
He's 53 now (gawd, the same as me - hopefully that's our only shared attribute). So let's generously give him 25 years of regular active sex life without the Viagra killing him.
Let's also assume he can find say 2,500 women that are prepared to bear 2 of his monsters, or else 5,000 at one each.
Let's also assume it takes an average of 10 tries to get each woman up the duff. So that's 50,000 roots in 25 years, or 2,000 a year (probably slowing down towards the end, lets start off with 5,000 a year and reduce as he ages).
So in that first year he has to perform about 14 times per day - every day of the year!
I guess at least it'll give him something to do other than wreck the US government.