Bundled pricing in German brothels

In an effort to boost business in these tough economic times, German brothels have introduced flat-rate sex promotions. Similar to an "all-you-can-eat" pricing at a restaurant, the promotions allow patrons to consume as much as they want. The promotion is not illegal, but it has led to objections from some law makers.

“This is an outrageous violation of human dignity,” Heribert Rech, the Baden-Württemberg interior minister, told The Times.

“So-called flat-rate sex is an immoral development which cannot be tolerated in our society.”

If flat-rate pricing is immoral; is per-unit pricing moral?