Eco-Friendly sexual relations or sex practices.
Some ways Jack and Jill practice Green Sex:

Instead of driving to the movies and dinner, Jack and Jill biked to the farmers market for food, and took a walk in the park.

Jack gave Jill locally grown, pesticide free, and fair trade flowers for valentines.

During sex, Jack and Jill used only all natural lube with non harmful chemicals that don't disrupt the balance of the environment.
by lomov September 21, 2010
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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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