The travel and hospitality industry has tried so many ways to go green – from trying to wash fewer sheets and towels to using organic products in spas – that you might start to wonder if it's running out of options. Well, if that is a concern, it's probably time to look to the world's oldest profession for some new ideas.

In Berlin, a brothel is ready to make you feel good for doing good. Clients of Maison d'Envie will receive discounts if the roll up to the front door via bike instead of car. There isn't much parking in the neighborhood, laments Thomas Goetz, the bordello's owner. So, he can free up some spaces for other businesses in this corner of what was once East Berlin, do his part to reduce carbon emissions and hopefully keep customers coming in the door despite the financial crisis.

Ride a bike instead of driving a car, and you get €5 (around $7.50) off the service you're looking for. Currently, 45 minutes in a room (not necessarily for conversation, since prostitution is legal in Berlin) €70, but cyclists will see that fall to €65.

Walking, unfortunately, won't get you the same perk. Goetz explains that he doesn't have a way for customers to prove they didn't drive and park nearby.

Can you think of a better way to save the planet?

Filed under: Europe, Germany, Hotels and Accommodations, Nightlife