I believe that the “ rule” had to be hurriedly written when “ XHamster”, apparently a porn purveyor , looked like taking on a biggish pro team a few years ago.
Back in the day, we had a Netherlands kermesseteam sponsored by a “ sauna” - who also provided team buses for Cipollini and others with lingerie-clad women liveries. Google Sauna Diana cycling if you don’t believe me.