I'd imagine it's pretty difficult and the consequences would be bad if caught. My mom was actually telling me that about 15 years ago she went to the immigration offices for her AOS and somehow overheard an interviewer asking a couple some pretty "disgusting" questions. My mom says she doesn't want to repeat what the officer was asking, but I like to imagine it was probably stuff like "Is he circumcised?" "What does his anus/her vagina taste like?" "Does she like anal?"

So you would have to be really careful so that it appears legitimate.