So, i play a Male main char. Eventually i have a son. It kinda frustrates me that eventually i have to unlock intimacy with him to lvl him up. After that random events are an ass to me xD. (yes i know i can just load Autosave to try and change lvl up Requisition,)

Any way to fix this?

You can unlock intimacy and then stop the sex scene immediately.

The oblivion potion clears out what they think they want to level up. No guarantee it won't just roll the exact same thing, but at least it's an in-game option instead of save scumming.  It does raise their magic toxicity though and can cause them to start mutating if you do it more than once.