he will mention it, but he won't stop you. you can reload nameless sex, but not choices that matter.
which is intentionally since the nameless has a variation if you're out of sanity where... I won't spoil it. if you wanna try it, have fun :P
I hope in a future update, Nameless brings out the topic, like "You had intercourse with me X times. Someone has missed my pressence a lot. You just wont have enough, do you?" xD
However, I dont know if thats even possible to code. If Hyao, made possible for Nameless to remember our choices, perhaps could be done? :P It would be fun.
I know for certain it's possible to code but how likely and how much difficulty are things I don't know, I'm betting it would be INCREDIBLY hard because it requires the game to tell exactly how many times you loaded a save with his scene in particular which would also require some different things because everyone will have that scene saved in the saves screen somewhere different making it not a "this particular save" thing but a "anytime this dialog is being read/played through needs to get recorded" so it would also have quite a few variables I believe because of that.. but to be fair I'm not a computer coder or professional this is all stuff I'm guessing off what others have said so maybe it's actually kinda easy, all up to Hyao to either confirm or deconfirm.