With that very young intern in his employ. Traditionally known as sexual harassment. Of course that was just one of the many cases of impropriety with women and allegations of assault.
Many will argue that there is no way to know if there was true consent when there is such a power differential between the two parties and especially when the act is taking place in the workplace between boss and subordinate.
Which is why most workplaces require any kind of relations like this to be declared in writing to HR or in some cases forbidden all together.