There may be aliens, but what if there are no aliens? The idea there are no aliens, is known as the Fermi Paradox. The Fermi Paradox states that if there are no aliens, what is the reason for there being no aliens?
My reasoning is this. On the primitive planets, they looked like monkeys or apes. The female aliens had no sex drive or lust for the males. Once the males gained more awareness, the males just didn’t feel like dealing with female hypergamy and high standards so they quit trying to get laid.
Each new generation of male was more cuky than the last, trying less and less to get laid. Any male that had a sex drive, would be shamed by the other males. Eventually the males brainwashed themselves to believe that sexual intercourse was bad. Each new generation was taught that sexuality is bad and intercourse is bad. The females had zero lust or sex drive for the males and the species went extinct. This why we don’t see any aliens on Earth.
Humans only survived because the human female was the most beautiful being in the galaxy (due to beauty being objective.) If females were not so hot, males would have given up trying to get laid long ago and we’d all be extinct.