Amanda Seyfried has been instantly sexually attracted to every man she has dated.

The 'Lovelace' actress says ''sparks don't grow'' and she needs to have a physical chemistry with a guy straight away to agree to date him.

Speaking in the new US issue of ELLE magazine, she said: ''Everybody I've dated I've been sexually attracted to immediately. Sparks don't grow - your vagina doesn't become more inclined to wanting someone just because you're around them!''

Amanda - who is currently single - also revealed she has a crush on a mystery man she has known for a long time and she even dreams about having kids with him.

The 27-year-old blonde beauty revealed: ''[He's] someone separate from my industry life - I've known him since he was 16 ... I picture him as the father of my children all the time. But it is a fantasy right now.''

Amanda has took on her most challenging role to date in Linda Boreman's Linda Lovelace biopic - in which she plays the infamous 'Deep Throat' star.

Speaking on the risqué film, she commented: ''I read the script and I was like, 'Wow, this is the riskiest thing that's happening [in Hollywood] right now.' The first thing you think about is that it could have ruined my career. At the same time, I was like, 'This is my chance to show them, to show the industry, to be recognised.' ''