This. I'm wondering this as well. If sharing points are needed for her to get down with the other girls then ok but I still wanna cock block the male NPCs.
All indications thus far seem to imply that even if you enable potential sharing of D with other men, you won't have to actually agree for that to happen when push comes to shove. Literally.
But, I could be wrong in my interpretation.
Still, all those against the idea, what if it is what D wants? Maybe consider another save path where you try it out and see how she reacts?
For example, I have a D-only save path where she and the MC are absolutely 1:1 with no deviations. They are marked in my save screens with a "D" to keep me on track.
But, I also replay each installment on an EVERYTHING IN THE UNIVERSE IS POSSIBLE path, because I'd like to experience all the content and perspectives the team has to offer, plus I'm really curious how the harem-ish and group sex situations will pan out.
I realize not everyone wants to see stuff against their general likes or whatever and respect each person's ability to make their own choices. I guess the thing I most appreciate is the ability to check out any or all options in a non-destructive manner, because the MrDots team has implemented a gazillion Save pages in Ren'Py and I can have one set of saves start at page 1, the next set of saves at page 50, etc. (which is not something I get in many games today, unfortunately.)