Anything with more than three participants becomes tricky to set up, in particular not together with certain unfortunate habits. But a well-posed orgy scene is amazing.
Trying to make the MC the clear centrepiece of a bunch of women attending to him is probably going to end up ridiculous or pathetic. It becomes even worse if the female LIs are placed in a queue to patiently await their turn to service the male MC. On the other hand, something like an oral daisychain feels contrived. It can work in a setting where the participants would do it once on purpose, but that's about it.
So for a great orgy scene, you'd want to subdivide the participants in smaller groups (2-3 each). Just making it a bunch of couples fucking side by side is boring, too. So you'd want some interaction between the different groups - looks, a little bit of touching can work visually, but in a VN they can obviously also talk to oneanother.
Another issue were the culture surrounding AVN development is highly problematic when it comes to high-quality output is the number of penisses. Having a single penis for an orgy of 5+ people is just very limiting.