Those folks are awfully annoying with their constant spam, but you did make me curious.
I started a NewGame+ on Easy to test this out.
Obviously, the tutorial has you unavoidably fuck the first girl with a goblin.
I would claim it's not NTR if it's not your girl, so she's immediately sold.
The goblin is retained for the first monster requirement.
Half the initial 1000 is spent on a clean new girl.
I bought one with small tits not thinking, but big ones will make this easier.
Delete the ranch-side tutorial mating room for good measure ( as no monster will touch your girls )
Then toss the girl you bought into the estate.
There create a private room and a birthing room.
The initial girls will have low stats, but they snowball quick as you work your way down the generations.
In no time flat they're all multi-birth and 100% conception rate.
Selling the lesser girls for money and hand rotating the first batches throuhg a milker to sell milk for extra cash.
I had enough money shortly after the first goblin was sold to buy the next.
Over time I built a 32 girl milking ranch, four stories tall with a center column of four milk rooms with slave rooms on either side.
The gap made it easier to repetitiously go down the lines grabbing the girls from one side and cycling them through the milker, from top to bottom, then the next for each top to bottom again till all girls had cycled.
Once you have the milk farm, sell any leftover girls until you get the body chop shop.
From then on, sell milk and keep working your way down the generations, cycling each previous generation into the chop shop.
You'll have to grow all of the minotaurs and salamanders from origin DNA.
When I stopped earlier, I had 3 minotaurs and 2 salamanders, and I'm just about to hit day 30.
All of the other monsters can be purchased directly from the store and just handed back when the time is right.
You'll be able to pick up some extra cash selling chop shop components, but the milk will still be the main driver throughout.
From a single girl purchased at the beginning of the game, you can definitely make it to day 50 without any monster touching any of your girls.
I'm choosing to ignore the tutorial girl since you sell her without touching her, as I've done it.
That makes the answer a surprising and resounding "Yes, you can play this monster breeding game through to victory while avoiding NTR the entire time"
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( I bought a customization potion to increase my cows tits sizes by replacing them over time, hence only some big tits here. accidentally used the first potion on a loli, wasting it since I only wanted to adjust tit size, which they lack ).
>ability to unlock NewGame+ so you can build your free milk farm and hump your legion of milk cows and meat girls into existence while avoiding NTR is left as an exercise for the reader