My Stone Age Primal System!

Rowan, an ordinary office worker with a penchant for binge-watching TV shows and ordering takeout, finds his life turned upside down after an exhausting workday. One evening, while lounging on his couch and watching TV, he falls asleep. When he wakes up, he discovers he’s no longer in his familiar world but has been transported to a primitive stone-age realm.
This new world is starkly different from anything Rowan has ever known. The people here wear only animal skins around their lower halves and live in a society where magic is real and prevalent. Some individuals possess extraordinary abilities, reflected in their "status" skills.
The society is divided into tribes, each with its own magical specialties and ways of life.
Rowan’s arrival in this strange world doesn’t go unnoticed. He is soon approached by a mysterious figure who informs him of his new identity. Rowan learns that his new name is Ulug, and he has been granted a unique system that allows him to level up and become powerful in a completely unique yet welcomed way. This system grants him extraordinary physical abilities and a youthful appearance, as his new form is that of a 19-year-old.
As Ulug, Rowan must navigate this wild and untamed world, learning to harness his new powers while adapting to the customs and dangers of his surroundings. Can he lead his tribe to be the best in this world? Can he do the one thing no tribe has even done before and unite all of them under one banner?
But of course that's not all he is adapting to. With less rules comes the immorality and freedom unlike any other, yes, hunting and fighting is necessary but so is having beauties and sating his lust.
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The story is inspired by 'The Pervert's World'. One of the best snu snu ever written. So you might notice the similarities. I have just used the plot, since I like it. However the story is different from that.
Don't take the story too seriously, it's just harem and boyish fantasy through and through. It's going to be a wish fulfillment thing with lots of snu snu. I don't really like unnecessary depressing stuff so the story will always be in favor of the MC. Don't worry though, there will be tons of conflicts and fights and everything in between.
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