if you were talking about Sexual Experience then the max level is "Expert"
you should "check nearby area" and seduce wolves for grinding "Mouth" and "Ass" till there is a choice said "accept your position" if you seduce enough amount of wolves (for me its the fastest way)
And for "Cock".... you can fully teasing every type of gender for grinding "Cock"
Its not that long to grind to "Expert" so dont worry darling...