Actress Angelina Jolie has told how being pregnant is great for her sex life with boyfriend Brad Pitt.

She told American magazine Entertainment Weekly that being "round" made them much more "creative" in bed.

She said: "It's great for the sex life. It just makes you a lot more creative. So you have fun, and as a woman you're just so round and full."

Jolie, 33, who already has four children to take care of under seven, is expecting twins. She is due to give birth in August.

When they found out about the twins, she said: "It did shock us and we jumped to six quickly. But we like a challenge."

Jolie accepted it could be a struggle to deal with all of the children.

Asked how she and Pitt, 44, planned to cope, she said: "We really don't know. His mom and dad are on stand-by to come out and help.

"And fortunately we can hire help if we need it, but we're going to try, as we usually do, to balance it as well as we can."

The Hollywood power couple have three adopted children: Maddox, six, Pax, four, and Zahara, three.

Jolie gave birth to their own daughter Shiloh two years ago.

She said they hoped to include the young children and make the task of bringing up the twin babies a "group thing" - by which she meant getting them to change nappies.

"They're old enough to feel included to change diapers themselves, to feed bottles themselves, like if I pump into a bottle. We're trying to find ways where it can be a fun group thing," she said.

Although she and Pitt have not wed, she said she had stopped correcting people who referred to them as husband and wife.

She said: "I say 'partner' sometimes. 'Father of my children' is too long. But half the time people refer to us as 'So, your wife this, your husband that.' We've stopped correcting everybody."