How to hide the dialogue during sex scenes?
You can't, Dev didn't include this option when creating the game.
That is unless you are bored enough to search for a way to patch the game yourself... like I did.
instruction : download and extract the .rar archive down below
1) in the www\js folder, do a backup of the "plugin.js" file just in case.
2) put the "HIME_HMSHideMessageWindow.js" file in the www\js\plugins folder
3) put the "MVPluginPatcher.exe" and "plugins_patch.txt" in the main game folder (the one with the game.exe)
4) Execute "MVPluginPatcher.exe".
Launch the game to check if everything work. Now, the "pagedown" and "w" keys should hide and bring back the text box.
Or you can also Right click
Edit : Forgot to mention but these files were created by people wayyy smarter than me, I just mixed and used them to patch this already compiled rpgm mv game (could or could not work on other games for all I know) So all credits goes to them : "HIME" for HideMessage plugin and "emerladCoder" for PluginPatcher.