3) CERTAIN USES OF COMPUTER SERVICES OR DEVICES PROHIBITED.—Any person who knowingly uses a computer online service, Internet service, local bulletin board service, or any other device capable of electronic data storage or transmission to:
(a)
Seduce, solicit, lure, or entice, or attempt to seduce, solicit, lure, or entice, a child or another person believed by the person to be a child, to commit any illegal act described in chapter 794, chapter 800, or chapter 827, or to otherwise engage in any unlawful sexual conduct with a child or with another person believed by the person to be a child; or
Extract from chapter 800:
800.03
Exposure of sexual organs.—It is unlawful to expose or exhibit one’s sexual organs in public or on the private premises of another, or so near thereto as to be seen from such private premises, in a vulgar or indecent manner, or to be naked in public except in any place provided or set apart for that purpose. Violation of this section is a misdemeanor of the first degree, punishable as provided in s.
775.082 or s.
775.083. A mother’s breastfeeding of her baby does not under any circumstance violate this section.
History.—s. 1, ch. 7360, 1917; RGS 5445; CGL 7588; s. 1, ch. 61-51; s. 779, ch. 71-136; s. 3, ch. 93-4.
Skinny dipping means naked swimming.
Florida state law determines parental responsibility and minor status (child) as under 18.
So yes, a crime would have been committed from the information we have seen. Whether or not the authorities have the appropriate evidence, and/or the desire to pursue an international warrant for this is another thing.