get one's freak on vs keep it in one's pants

get one's freak on

verb

To have sex.
To go crazy; to freak out.
To dance.
To party.

keep it in one's pants

verb

To refrain from trying to have sex with someone.

How often have the words get one's freak on and keep it in one's pants occurred in a corpus of books? (source: Google Ngram Viewer )