在美国移民局公布的不得入境的十大类型人之一,就是有过卖淫嫖娼行为的人员:
The following are grounds for inadmissibility due to criminal reasons:
“any person coming to the United States to engage in prostitution, or any person who has engaged in prostitution within ten years of his or her application for a visa, adjustment of status, or entry into the United States, is inadmissible. This section also applies to those who have made a profit from prostitution”
申请来美人员应该在签证表上都回答过这个问题的。
链接on page 4:
https://www.uscis.gov/sites/default/files/document/foia/Inadmissibillity_and_Waivers.pdf