A team of male workers traditionally welcome the new members of their group by a night of drinking at an "adult" club. They insist their newest female team member do the same. This behavior may be considered sexual harassment because .

they are creating a hostile environment

Explanation:

The hostile environment is a very difficult environment in the organization especially for a new employee and creates very uncomfortable or difficult for an employee by differentiating the age, sex, religion, etc. The hostile environment includes sexual harassment that is passing jokes sexually, touching without permission, sexual comments, etc.

Therefore as per the given question male employee is asking to join the adult club to the newest female employee, this situation firstly is wrong because the male is inviting to female for the adult club so situation becomes hostile environment for female employee.

lives by a moral and ethical code