Functional copulation?

Looking at my AdSense accruals stand at a paltry $1.76 (though a ten-fold increase from $0.17 in March) and my readership going for less than one (me!), I've decided to write something spicy. It's about Niyoga that I came across here.

I was told in my younger days that Rishi Vyasa gave the kids that were to be Dhridharashtra, Pandu, and Vidhura as "boons". Not that I believed in the euphemism. ;) Reading about Niyoga makes me wonder if it's possible to "perform" the act merely for functional reasons! One of the points about detachment from the "product" (offspring) is quite a practical thing, well thought. Why did they adjust to limitations, they should've invented artificial insemination instead. By the way, what's with ghee? ;)