Define Hanging Lights Meaning

Hanging Lights
around Christmas (or any time for that matter), when you use this as an excuse/another name for sex or anything of that sort.

"Dude, that girl's so hot, I'd like to hang her lights."
"So I went to this party and walked in on this guy and girl. She was all up on him, hanging his lights."
"Hey honey, wanna hang lights?"
"My girlfriend has the best lights...I hang them every day."
"I bet SHE can hang some mean lights."
"Last night I got my lights hung. It was amazing."
"My parents caught us hanging lights"
By Nell