hymeneal vs prothalamic

hymeneal

noun
  • A hymn, song or poem in honour of a wedding. 

adj
  • Pertaining to marriage. 

  • Of or pertaining to the hymen. 

  • Pertaining to sexual relations. 

prothalamic

How often have the words hymeneal and prothalamic occurred in a corpus of books? (source: Google Ngram Viewer )