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It sounds like there's a very important reason why Kristen Stewart should stay with Robert Pattinson  aside from all the obvious reasons, of course.

An unidentified ex-girlfriend of Rob's is spilling sexy bedroom secrets to Hollywood Life, and it sounds like Rob is quite the dynamo in the sack.

“No matter how much we fought, it was always amazing in bed!” says the ex. But would you really expect anything less from Rob?

His ex says that even when they were out with friends, the two only had one thing on their minds.

“We’d glance at each other throughout the night because it made it more exciting when we got home," she reveals. 

Wow! Is it hot in here, or is it just us?

As for Rob and Kristen, they're currently doing the long-distance thing with Rob filming in Australia, although rumors say they're nearing splitsville.

But who would want to say goodbye to someone who as good under the covers as Rob supposedly is?

Source: Hollywood Life