Henry Cavill and Kaley Cuoco are ''completely in lust with each other''.

The 'Man of Steel' actor reportedly started dating the 'Big Bang Theory' beauty after his 10-month relationship with actress Gina Carano ended recently and right now friends the relationship is mostly physical.

A source told RadarOnline: ''Henry and Kaley already seem like the perfect couple.

''Henry has always thought Kaley is beautiful and the crush before they even met each other was mutual. Now that they're dating, they're completely in lust with each other.

''They're having a lot of fun together and really enjoying getting to know each other.''

Before dating Gina, Henry was engaged to equestrian Ellen Whitaker before it ended last year and Kaley recently split from musician Bret Bollinger.

Before that, she dated Johnny Galecki, her co-star from the CBS show, for two years and had a short lived engagement to date addiction specialist Josh Resnik before splitting in March 2012.

Henry previously admitted his work makes relationships tough, but insists he would never be unfaithful while away on set for long periods of time.

He said: ''It takes a lot of understanding from the other person, because there's a lot of time apart, but I've always been a monogamous man.''