One cheeky Danish company has encouraged the royal couple to spice up their love life with a wedding gift of an erotic board game known as Trivial Pursuit without clothes.
Crown Prince Frederik and his Australian fiancee Mary Donaldson have already received an array of standard diplomatic gifts for tomorrow's wedding in Copenhagen, including nine Tasmanian trees, an Iranian rug and Greenland Inuit garments.
But Erotic4Real, a board game for adults, is probably one gift they didn't put on the wedding register at David Jones.
Erotic4Real creator Tine Sjorup said the game would enhance the marriage of Denmark's next king and queen.
"Our wedding gift is so important for the healthiness and happiness of their marriage," Sjorup said.
"With special thought to the cultural differences between Denmark and Australia, we are convinced that Mary and Frederik will appreciate this as one of the best presents ever received to ensure a deeper insight and understanding to each other's feelings, thoughts and desires.
"Erotic4Real is the ultimate relationship game for everyone who wishes to have a more communicative and deeper connecting relationship."
The game has Danish and English versions and has just been released in Australia.
Dozens of presents have already been delivered to Christiansborg Palace in Copenhagen where they will be put on display after the wedding, but it was unsure whether the gifts would be censored.
Other gifts include the Flora Danica dinner set, given by the people of Denmark out of the 12 million kroner ($A2.75 million) raised from public donations.
They have also received a Max Dupain photo of the Sydney Opera House which was designed by Danish architect Joern Utzon, whose daughter Lin designed another dinner set decorated with scenes from Hans Christian Andersen fairytales.
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