What is "tonguings"

Usage examples of "tonguings".

I suspected she was see­ing Catalina often in the city during the day, and I was right, though in my naive Western materialist way I imagined they were merely having a love-affair, meeting in hotel rooms for interludes of slippery grapplings and tonguings, when in fact it was Sundara's soul far more than her body that had been seduced.