"When the field workers are all virgins" isn't a simile. A simile is a direct comparison using the words like or as. I think its a metaphor.. Google it. :P
In the book "The Glory Field" by Walter Dean Myers, an example of a simile is "the woman was as pale as a ghost."
Worked in fields
Slaves were commonly utilized as field workers in the southern United States during the antebellum period, particularly in states where plantation agriculture like cotton, tobacco, and sugar was prevalent. Plantations in states like Georgia, Mississippi, Louisiana, and South Carolina relied heavily on enslaved labor for crop cultivation.
Astrobiology
Craftsman!
Any comparison that uses like or as is a simile. Otherwise it is a metaphor. Like a giant bird flapping its wings, the airplane flew over the field. Simile. The airplane accelerated down the runway and with a mighty leap the giant bird flew into the sky. Metaphor
That's probably going to depend on where the charge is, or, for that matter, the nature of the origin of the field. There is much here that you have not told us.
enslaved African workers
The use of the promotora model refers to workers of a health community. These workers are not necessarily professional workers of the health care field. These workers are predominantly volunteers.
Artisans and craftsmen, domestic workers, and field workers.
the need for field workers
Para-Legals.