I'm not saying he's wrong. I'm merely pointing out the mix up.
stu's question was in regard to Fantasy, where pregnancy leads to a bad end/reset. Vendovah's answer, however, only applies to Monochrome (Inusuku's previous game), where a good pregnancy ending can be achieved provided one has the necessary stats and money.
The only mix up here is that you and I have different definitions for what "good ending" means.
If you get your sister pregnant in fantasy and don't have high enough stats/money, you will get a
bad ending where she hates you, explodes, etc. (I never got the bad ending, so I don't know the specifics)
But if you
do have sufficient stats/money, you get a
good ending where you retire from adventuring and live happily ever after with your pregnant sister/wife.
In both "endings", the game
ends. Apparently by your definition that simple fact makes either ending a "bad ending", but clearly I (and several others) disagree.