love up vs tup

love up

verb
  • To make love to. 

  • To demonstrate affection for; treat in a loving way. 

  • To demonstrate affection (on somebody). 

  • To accept; to love wholeheartedly. 

tup

verb
  • To have sex with, to bonk, etc. 

  • To mate; used of a ram mating with a ewe. 

  • To butt: said of a ram. 

noun
  • A male sheep, a ram. 

  • The head of a hammer, and particularly of a steam-driven hammer. 

  • Two pence. 

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