Forced by group of girls to masturbate(male)

At university one of the classmates stripped me to make me complete his assignment.After completion of the assignment he tied me and left me with his girl friend. Laid me down on a plastic sheet at a apartment which was gettin rennovated.
The GF would check on me and everytime she came she made me cum,even after I told her my pennis hurt.When the workers came in to work she told them not to bother me and she stood there watching me getting soaked in the wet plastic sheet and she enjoyed the workers(guys) watching me.I stayed that way for almost a whole day!Is it healthy to expose vital private parts to plastic sheet with dirt and my own cum.Do girls enjoy watching helpless naked men watched by others