Forget bathing in the heart-shaped tub...This valentines day, run to your nearest spa and demand that they let you and your lover immerse in chocolate! Think we're kidding? A Japanese spa is offering just that this lover's day - as reported by REUTERS.

A Japanese spa is offering the perfect aphrodisiac for Valentine's Day - chocolate baths.Those who just can't get enough of the sweet stuff can immerse themselves in water mixed with cacao and fragrant bath powders. Twice a day, staff pour creamy chocolate over the bathers, who smear it over the bodies or lick it off.

"This bath is my Valentines Day gift for him this year," said Mayumi Uekusa, who travelled more than two hours with her boyfriend to the Yunessun spa in Hakone, north of Tokyo, to soak in a mixture of warm water, cacao and aromatic bath powders.

"Life ain't as sweet as this bath, darling," quipped her boyfriend Yuichi Omata. Japanese women have long been the ones to give their guys gifts on Valentine's Day.

While couples shared romance in the bath, families with grandmothers and babies in tow also spread chocolate over their faces and bodies. Everybody wore a bathing suit.

In Japan, as in many countries, chocolate and romance go hand in hand and for many lovers, Valentine's Day just wouldn't be the same without these sweet treats.

The Aztecs believed chocolate was an aphrodisiac that invigorated men and made women less inhibited, and when it came to Europe, it quickly became the perfect gift to inspire lust.

Modern research shows that chocolate helps release "feel good" hormones in the body, which trigger reactions that mimic the feelings associated with being in love.

The Japanese spa resort offers dozens of other "amusement" baths, including a wine bath, a coffee bath, and a sake bath.

In the past, it has even offered a curry dip. A ticket that allows access to all these baths costs about 3,500 yen ($US28).