love up vs slip it to

love up

verb
  • To demonstrate affection (on somebody). 

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

  • To make love to. 

  • To accept; to love wholeheartedly. 

slip it to

verb
  • To sexually penetrate 

  • To smuggle (something) to someone; to surreptitiously pass (something) to someone. 

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