If you play a game with the harem tag, you don't exactly expect the MC to be with one woman.
What a silly comparison.
This really says a lot about ntr harem defenders.
I would be ok with all this if this was avoidable, but let's bring up Desert Stalker as someone else did:
There are virgin heroines that never touch/touched another male, unless specifically told by MC.
That alone makes it infinitely more attractive as an harem game.
The MC is also a top tier man in their setting that gets benefits specifically because he's so good at a vital role for his setting.
And absolutely none of taht comes from him being a virgin before marriage, it comes from his other qualities.
In comparison, the girls are valued not only in duty, but in sheer loyalty and exclusivity in their relationship to Him. He's their one and only, and that's a given, because dude's the top dog around.
It's part of the power fantasy that "man being good at something = rewarded with something men want" aka exclusive relationships with chaste women.
I'm trying my best here to explainsuch a basic premise to what makes harem attractive.
I get a lot of shit from other harem fans because I'm actually ok with the harem members getting it on with each other, because I like a good show on the sidelines, but having an ugly bastard around to fuck the women you're supposed to want exclusivity with doesn't even begin compare.