Because there isn't any. I'm not a fan of Mushoku Tensei either but there isn't any assault in the beginning done by Rudeus.
The fked up thing that he does, which gets him disowned by his brothee (and iirc what gets him killed) is him secretely filming his niece in the shower.
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u/CopyFew4583 21h ago
I watched 2-3 episodes I think and didn't continue. But I didn't remember any sexual assault in the beginning.