I've often thought the questions that the USCIS asks to judge moral character are absolutely ridiculous, and this is one of them. Other ridiculous questions include asking you whether you are a "habitual drunkard".
WTF does that mean? I mean one person's good-time personality is another's "habitual drunkard". As for the prostitution question, I guess the USCIS forgot that, in some US jurisdictions and many foreign countries, prostitution is a legal activity. But if it's not specifically outlawed by the government, how can that same government turn around and judge people who partake in that activity when they go to Las Vegas? I just don't get it - another double standard used by the USCIS to hold immigrants to a much higher standard than natural born citizens.
Anyway, we all know that the USCIS is seriously messed up, and the point of this forum is to address issues, not go on political rants. Kamaratina, best thing for you to do is consult a good IMMIGRATION attorney (not a crimianl one) before you apply and then take the attorney with you to the interview, if the attorney advises you that it's OK to apply. I know I'm being overly-cautious here, but my wife's IO indicated to her that he deports people at citizenship interivews "all the time"...In his words, "many people who come through that door are not citizenship material". Just be careful, and follow an attorney's advice.