SexInf101.com's Sex Blog:

According the journal Human Nature a woman's sex drive begins to plummet once she is in a secure relationship. They found 60% of 30-year-old women wanted sex "often" at the beginning of a relationship, but within four years of the relationship this figure fell to under 50%, and after 20 years it dropped to about 20%.

Conversely, they found the proportion of men wanting regular sex remained at between 60-80%, regardless of how long they had been in a relationship.

The scientists said the differences resulted from how humans had evolved. For men, a good reason their sexual motivation to remain constant would be to guard against another male taking their place. However, women have evolved to have a high sex drive when they are initially in a relationship in order to form a "pair bond" with their partner. But, once this bond is sealed a woman's sexual appetite declines.

A man and a woman who have never met before find themselves in the same sleeping carriage of a train. After the initial embarrassment they both go to sleep, the woman on the top bunk, the man on the lower.

In the middle of the night the woman leans over, wakes the man and says, "I'm sorry to bother you, but I'm awfully cold and I was wondering if you could possibly get me another blanket."

The man leans out and, with a glint in his eye, says, "I've got a better idea... just for tonight, let's pretend we're married."

The woman thinks for a moment. "Why not," she giggles.

"Great," he replies, "Get your own damn blanket!"

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