Kristen Stewart says falling in love is the most ''intense overwhelming'' feeling.

The 'Twilight' star was forced to remember the first time she fell in love and had her heartbroken for her role in 'Equals' and whilst she has good memories about love, she admits relationships can go ''epically bad'' as well.

She told Entertainment Tonight: ''I read the script and I was just like, 'This is going to suck and hurt to think about.'

''You just place yourself in that feeling that maybe you've had before - it's the most visceral, intense overwhelming feeling - so when it's really great, it's epically great, and when it's really bad, it's epically bad. So we knew going into it, this was gonna be like ... 'Oof, this is going to hurt.'''

Meanwhile, the 26-year-old star - who has romanced both men and women in the past - insists she never wants to define her sexuality.

She said: ''Me not defining it right now is the whole basis of what I'm about. If you don't get it, I don't have time for you. There's acceptance that's become really rampant and cool. You don't have to immediately know how to define yourself.

''I had to have some answer about who I was. I felt this weird

responsibility, because I didn't want to seem fearful. But nothing seemed appropriate. So I was like, 'F**k, how do I define that?' I'm not going to. Plus, I didn't want to f**k with other people. I didn't want to be this example: It's so easy. I don't want it to seem like it was stupid for them to have a hard time. I find the movement that's occurring to be so important, that I want to be part of it.''