Only as long as the MC is also involved while its being done. MFF is okay but not just FF with MC watching.
I like to immerse myself in the story with MC being the center of attention.
Or do you just want to have all the girls to yourself? Will you let them play with each other only when they are with you? Since some devs add this type of content. Would you have a passive trans girl in your Harem? (if you are into them)
Trans/trap/futa/femboys in the harem are fine and they can all play with each other. The key point is that it's MY harem and they're MY LIs and every last one of them will happily spend their time with me.