The first step in a sexual realtionship involving making out or french kissing

In relationship/sexual terminology, this is the Stage in dating where the couple kisses, or makes out.
It is the First Stage, starting with the first kiss, and leads to repetition to say Goodbye or Goodnight.
It signify's the Beginning of being in love.

This can lead to French Kissing, or kissing of the Tongue.

This is the Beginning of Courtship, or a Physical-Loving Relationship that naturally resolves to advancing sexual stages until 'Home Plate'.

French kissing. Is followed by feeling up second base, oral third base and sex home run

The French Kiss. Not just a peck on the cheek or lips. You gotta use your tongue.

Snogging / Making Out / French Kissing

when two people are making out