"I can't deal with someone wanting to take a relationship backward or needing space or cheating on you," she says in the December issue of Cosmopolitan. "It's a conscious thing: it's a common sense thing. ... I just don't ever want to end up in a relationship that isn't fair ever again."
Although she's been linked to actors, musicians and even a Kennedy, Swift, 22, is more concerned with chemistry than anything else.
But while her love life provides endless inspiration for her hit songs, the Grammy Award winner says there's only one thing she'd do if she wasn't making music.
"Being a mom full time, doing everything for my kids, having a bunch of them," she says of her future aspirations. "That's the only other thing that could be as thrilling for me as doing this."