Can my boyfriend actually like to see a ?

Yes, you should be worried. And yes, if s are needed, they should be with her fully clothed. Kids need their dignity. Also, at this age, it is time to start using other punishments such as time outs. You might want to check out some books from the library about the psychology of ing children. It does more harm than good as they grow up. And the s should always be private again to grant some dignity to the child.