Sex is the secret to staying slim, says reality TV star Luisa Zissman...

London: Luisa Zissman has revealed that she thinks sex is the secret to staying slim.

The 26-year-old reality TV star said that locking lips with your partner is not only good for the relationship, but also helps in reducing the waistline, reportedly.

She said that 10 minutes of kissing, morning and night, can burn up to 100 calories a day, which equates to 36,500 calories a year, 10lbs worth of weight loss.

Zisman added that Japanese scientist Shukan Tokuho have said that a five-minute vigorous masturbation session can burn up to 300 calories a tim.