Moral turpitude, severe violations of the religious freedom of others, intent to become a prostitute, not if you want a USA visa, you don’t.
Why are US visa questions so weird? (Financial Times – Registration Required to read the linked article)
The reason US visa forms seem such an odd accretion of questions is that is what they are. They have been added to over the decades to confront whatever danger the US was dealing with at the time.
Are the visa forms an effective way of keeping undesirables out of the US? “If we’re interested in keeping people who mean to do us harm out, it’s not very effective,” Mr Chishti says. Biometric screening, databases and finger printing are far more useful, he says.