Drams are triggered by emotional reactions, whether overt or subtle. Dream settings that refer to your past, such as old workplaces typically refer to situations that occurred there or your feelings about that job or how that job situation relates to a current life situation. Some believe that celebrities are said to represent spirit guides, but more often than not, they're in your dreams to convey a message and it depends on how you think about them. If you like Taylor Swift, it could be trying to convey the word swift or quickly or it could be referring to female verbal energy or expressing yourself. Ross and Rachel and Monica are from Friends, so friends having sex usually refers to merging energies, nothing more. This may indicate you admired a friend of yours perhaps for a particular trait or quality they have that you wished you had or something similar.