Why can Indian monks break the lust caution?

I'm not sure about the details. Maybe you misunderstood. Starting with the precepts set by Sakyamuni Buddha, the first one is to abstain from making. Why did Indian monks break this commandment? On the surface, it seems that he can't keep this commandment. Fundamentally speaking, he didn't get the benefits of becoming a monk, so the secular heart got up and gave up. Some people may say that life practice is just nonsense. Men and women are the foundation of life and death.