Kim Kardashian West says she's been having sex '500 times a day'

The 34-year-old star and her husband Kanye West - who have 20-month-old daughter North - are desperately trying for a second baby, but the stunner's over-the-top detail about their attempts has not gone down too well with her sister Khloe Kardashian.

In a trailer for the new Keeping Up with the Kardashians series, Kim is seen lying down on a sofa looking exhausted before saying: "I've been having sex 500 times a day."