First, I have a bugfix patch that improves the modding system among other things, which is located on the Strive Discord(https://itch.io/t/284398/discord), just search for "change log". The Discord is the best place for modding advice as the most active modders tend to be there. The bugfix won't help you with your particular problem, but it comes with an improved tutorial in the mod system's help section.
Second, the game usually opens with 2 windows: the game window and a terminal that lists errors. That second window can be quite useful when things don't behave properly. So I ran the game with your scripts to get the error messages, and found that the logic of your file does not agree with the logic of the sex system.
I'm on lunch break so this is a bit rushed. The game expects basically a 1 to 1 pairing of persons and parts used. So "takerpart2" implies that there must be second giver to match the second part occupied on the taker. Also there is no "takerpart3" in the game's logic, but if it did then it would require a third giver, so tentaclefull just won't work the way you expect. Next, the logic of your requirements allows for either 2 givers or 2 takers, so long as one has 2 and one has 1, but as I pointed out this is not how the parts work. The system is a bit convoluted and broken. I'll see if I can find a work around when I get done with work, but chances are you'll have to make do with matching the profiles of existing actions, unless you mod "newsexsystem.gd".