The Empire State Building climbers have gone from popping the question on top of the skyscraper to swapping spit on the courthouse steps ... and video shows their latest makeout sesh.

Ivan Beerkus and Angela Nikolau were after a different kind of adrenaline rush when they packed on the PDA as they left court Monday ... sucking face with a bunch of cameras in their face.

The couple is facing multiple felony charges -- including reckless endangerment and burglary -- for the daring stunt they pulled last month ... when they scaled the Empire State Building for a marriage proposal.

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On Sunday, they took to Instagram ahead of their court date, writing ... "Whatever happens in court, we will respect the process and accept the consequences of our choices."

But this morning a grand jury still hadn't acted ... so Ivan and Angela have been ordered to come back to court on September 29 ... at which point, we're sure they will kiss for cameras again.

This is kinda their thing ... Ivan and Angela also made out when they were released from jail.

It's not getting old ... yet.