What a man needs to get sex (without resorting to prostitution). Even if the man is handsome, you need to come to a bar, get to know each other, treat the woman, engage in conversation, be good at humor and courtship, and only then... Maybe... And what does a pretty woman need? Come to the bar and wait! It's not sexist - it's just the obvious truth.
Therefore, it is much more difficult to make Reverse NTR if the author wants it to look adequate. How strange would it look from the point of view of an ordinary player - Kirito just exists, and all the girls around him are trying to fuck him? Any male player would just scream, "This doesn't happen! Why doesn't anyone want to fuck me? There I am! Where are these women who want to take me away from my wife?" Don't forget - this is Reverse !NTR!, meaning Kirito must resist, and Asuna must be blind.
"Fuck, Kirito just went out to the store, and Liz already dragged him into an alley and persuaded him to suck his dick."
"Kirito just came to Suguha's for dinner, and she's trying to rape him." (Fujino added a little Reverse NTR, but it doesn't really stand out.

)
So the question is, if the Reverse NTR game is going to feature a healthy Kirito with a big dick and normal sexual desire, then why resist him? He doesn't lose anything, unlike Asuna. Double standards, like you said.
And what will be the ending? Asuna comes to Kirito, and he's sitting with ahegao's face surrounded by pregnant women? It's very strange.
View attachment 4968503
It seems to me that the developers just don't want to mess with something so complicated.