I explained it a few times (and will probably have to some more in the future), if bestiality was easily cut out and made as a patch by Prometheus, it's not the case of the relation between Marc and Myriam.As others have said, it's a shame that the relationship with Mark is no longer as it was at the beginning of the game. I also don't understand why the incest option hasn't been added to the patch.
Cassius and Hammer scenes could be cut without any influence with the rest of the game, but for Marc it was impossible, I had to modify the dialogues and the family setting, and in the future it would force me to work on two different games, one version with the old family setting and another with the new, getting more and more complicated as it goes... which would end up being a nightmare, that I don't want, so I prefer to cut short and only work with the new setting.