Lazyness is never a good excuse. But I guess that's just me on that one.
With that logic, any guy who drinks a cocktail or has something yellow or pink on him should me called "her", according to all those "alpha males" with weak-ass masculinity.
Anyway, if the dev didn't want to bother with rewritting scenes, he should have just imposed a singular MC and be done with it. Especially if it's a poor excuse for lazyness, since there's a fairly simple solution in copy-pasting the male sex scenes in any text editor, even fucking notepad, and using the replacing tool on the pronouns.