gross out vs yuck factor

gross out

noun
  • Something which sickens, causes distress, or appalls by reason of being disgusting, gory, or repulsive. 

verb
  • To sicken or distress (someone) by being disgusting, gory, or lewd. 

yuck factor

noun
  • Disgusting part of the nature of something; facet or tendencies (of a thing, idea, etc) to produce a reaction of repugnance or distaste. 

  • Recycled sewer water is opposed by many sanitation agencies due to the yuck factor. 

How often have the words gross out and yuck factor occurred in a corpus of books? (source: Google Ngram Viewer )