A Viagra-style pill for women could be on the way to help millions to finally reach their sexual peak in bed.

Researchers have uncovered a substance that boosts female sexual arousal, increasing her chance of orgasm.

The findings could pave the way for a drug similar in effect to Viagra, which has helped countless men.

Until now experts have been baffled by the fact that 40 percent of women have trouble reaching orgasm at some point in their lives.

But answers may have been found by a team working for Pfizer, the pharmaceutical firm behind Viagra, in Sandwich, Kentucky.

"We're beginning to establish pathways involved in sexual arousal," said Chris Wayman, lead researcher on the product.

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