Final answer:
The reference material provided does not contain specific data on the percentage of Americans who fantasize about having sex in public places, but it does indicate conservative attitudes towards sexuality among U.S. respondents in an international context.
Step-by-step explanation:
The question appears to involve attitudes and beliefs related to sexuality in the United States, hinting towards psychological and sociological aspects. However, no specific statistics about the percentage of Americans who fantasize about having sex in places that are public are provided in the reference material.
The given information indicates that the United States holds more conservative views on sexual behavior compared to other industrialized countries, with higher percentages of U.S. respondents expressing disapproval of premarital sex, extramarital sex, and sex before the age of 16. We also understand from the materials that the U.S. public is leaning towards education over abstinence in terms of sexual education, but there are no direct correlations to public fantasies. Therefore, based on the reference material provided, I cannot confidently determine the correct answer to the question regarding the percentage of Americans who fantasize about sex in public places.