>>531670974
From what I read from /hgg2/ I deducted several reason people would do a virgin run :
>They self insert as heroine and avoid rape scene
>They think heroine as his daughter and can't find good man who will take her virginity (usually because the men are ugly)
>They want to discover each unique dialogue/scene/ending from deflowering her so they fuck once and reload the data

>>531549718
>NBR
can marry
>blood related
Someday you will see her got married to random man

Virgin run is a term to describe where you take harder route to finish an eroge.
Most of Eroge has artificial difficulty and offer lewdness to overcome it.
So it's not necessarily a full blown virgin, because the dev can say whatever they want from their ass