Best example for this is when you can't have regular sex like you used to before you had kids. You could have pretty much done it anywhere anytime, but now that you have kids, it's a no go. They're always around. So you can only do it at certain times. Hence the term red light, green light.
red light green light sex:

Jack: Damn, never have kids man
Eric: Why not?
Jack: Because the sex is nothing but red light, green light!

*Kissing*
Jack: I'm in the mood.
Lisa : Sorry honey, but can't. I have to go pick up the kids from school soon.
Jack: *fustrated* damn it Lisa, every since we had the kids, its been nothing but red light, green light sex!..
by Erik/Raoul March 16, 2010
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A low-pressure sodium lamp (LPS) is a gas discharge lamp that uses sodium in an excited state to produce light. It has a glass tube containing solid sodium and a small amount of neon and argon gas. It emits a dim red/pink light at first, then a bright yellow light when the sodium vaporizes. It has some advantages for road and tunnel lighting, such as low glare, low surface luminance, and reduced accident rates. These lamps are mostly used for street lighting as well as industrial uses
Sox Street Light Sex Story is A low-pressure sodium lamp (LPS) is a gas discharge lamp that uses sodium in an excited state to produce light. It has a glass tube containing solid sodium and a small amount of neon and argon gas. It emits a dim red/pink light at first, then a bright yellow light when the sodium vaporizes. It has some advantages for road and tunnel lighting, such as low glare, low surface luminance, and reduced accident rates. These lamps are mostly used for street lighting as well as industrial uses
by SEX lamp July 30, 2023
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"what's those red lights above your bed?"
"oh they are my sex lights. "
by lethergo January 27, 2017
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Two words said together when a cops lights are on and flashing...'cause someone is gettin fucked. This is usually yelled to alert others of the popos presence
If you see a cop with his lights on just yell: SEX LIGHTS!!!
by Bob's your uncle September 21, 2006
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