Women have sex out of boredom, bribery for chores.

From News.com.au:

For every woman expecting the earth to move, there are two with more practical motives.

From relieving boredom, to keeping the peace or curing a headache, women have sex for many reasons but romance and passion come rather low on the list, a new book has revealed.

One woman even admitted to having sex just so her husband would put the rubbish out.

"Research has shown most men find most women at least somewhat sexually attractive, whereas most women do not find most men sexually attractive at all," Why Women Have Sex authors Cindy Meston and David Buss said.

Having apparently discounted physical attraction, the 1000 women interviewed by the Texas University professors gave a huge range of reasons for sleeping with a man.

One said she did it for a spiritual experience, proclaiming: "It's the closest thing to God."

But mostly the explanations were far more mundane, with 84 per cent admitting to having sex just to ensure a quiet life or to bargain for household chores. One woman said: "I have sex to relieve the boredom because it's easier than fighting. Plus it gives me something to do."