That is true a lot of harem/vanilla players don't want any men other than the mc to be involved with the girls. There are some that don't even want any of the girls in the harem to have sex with each other

. For me as long as that stuff is avoidable I don't care too much. But it also depends on how much of that stuff is in the game, for example I stopped playing the spellbook because half of the game was ntr. It was 100% avoidable but if I have to avoid half of the game's content it's not really worth it for me.