According to Hindu belief, the cease of desires, canceling the karma (karma is the result of your actions coming back to you in all sorts of ways and binds you to Samsara), and eliminating karma, frees one from samsara, which is the cycle of life and death.
And that’s the key to nirvana- the peak of ambition.
The Sadhu has the statues of saints. They can travel freely on buses and trains. These men undergo an irreversible medical procedure that neutralizes their penis and prevents it from the sexual function.