When it comes to mind-blowing sex in your relationship, it's all in the pelvis, a new report suggests.

The 2008 Orgasm Survey, sponsored by your very favourite mag (ding ding!) and PelvicToner creators SPM, found almost half of all women never orgasm from penetrative sex.

However, relationships do not need to suffer completely as women with a stronger pelvic floor have twice as many climaxes as those with a weaker one.

The study warned: "Nearly half of all women are not getting their share of orgasms!"

It urged women to tone up, adding that the g-spot is not a myth, despite varying in location from person to person.

Recently, blogger Sacha Molitorisz told the Sydney Morning Herald that dating duos should make sure their sex lives do not become routine.

He urged them to be "romantic and imaginative" to keep the spark in their relationships.

One useful tip suggested by the romance guru was for couples to spice up their sex lives with saucy underwear.

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