Kim Kardashian West claims her sex with Kanye West "gets a five-star rating".

Kim Kardashian West and Kanye West

Kim Kardashian West and Kanye West

The 'Keeping Up With the Kardashians' star has been researching the "astrological compatibility" of herself and the rapper in honour of his 39th birthday on June 8 and was very pleased with the results.

She revealed on her website: "I did a little research about Libras and Geminis and found out they're a perfect match!

"One website even said that we were one of the best matches in the zodiac. We're both air signs on the same wavelength. SO true! We've had an amazing connection right from the start....

"Libra/Gemini sex gets a 5-star rating because we're so in tune with each other."

The 35-year-old beauty - who has children North, two, and Saint, six months, with Kanye - claimed their respective signs mean they share a love of "travel, surprises and communication," while their differing personalities complement one another.

She wrote: "My serene presence soothes a Gemini , and Kanye inspires me during his creative surges."

In the post, Kim explained that her siblings Khloé Kardashian and Kendall Jenner had introduced her to their interest in astrology.

Earlier in the week, Kim took to Instagram to wish the 'All Day' rapper - who she described as her "best friend" a happy birthday.

Alongside a photo of herself and her spouse, she wrote: "Happy birthday to my best friend! I usually would be scared for us getting older but as each year passes I'm just happy we have more time on this earth together! I love you so much and hope this year brings you so much happiness."

Last month, the couple celebrated their second wedding anniversary and Khloe sent her best wishes while admitting she thinks they are made for one another.

She said: "It's your anniversary!!!!! I love you guys!!!! I believe in love at first sight but I will always believe that the people we love we have loved before. I believe you two have loved for life times and will forever more (sic)."