The woman has a crazy psycho brother who will literally attempt to beat you to the pulp, if you accidentally offend him by hardly doing much, and she has a dog that attacks men's crotches, and the guys get their crotches hurt around her in other ways as well.
The woman is a walking booby trap, and a walking crotch trap, and you think that the guys would learn to just stay away from her. Why do they keep coming back?
The brother is no problem, if you treat him well. The dog is not a problem, if you have watched even a couple of episodes of 'Dog Whisperer'.
The 'something' is probably symbolic. This movie is not claiming that Cameron Diaz has any special 'magic' about her; the movie just exists as a metaphor and expression of the ailment that can strike any man like lightning out of the clear blue sky, where you helplessly and uttely fall for some woman you had NO plans even having any kind of relationship with.
It can be a parasocial or real-life, and it can take months or even years to fully recover from. It's something you can't help, emotions can take control so easily even if they have lied dormant for a decade.
I think this is how simps are created; the simp doesn't understand that it's just 'emotional lust' or 'hormonal reaction' or even if it is something deeper and stretches beyond one incarnation, it's still crazy and emotional, and the problem is not that you can't have the woman; the problem is that your emotions want that woman.
This movie presents the typical hollywood solution to any emotional dilemma; the unrealistically 'happy ending' with an unattainable woman (in real life, a young woman like that would have about 10000 suitors, 200 simp 'providers', 50 'friends with benefits', 10 'animalistic alphas always ready-to-go', 5 marriage candidates, and a history of numerous, numerous 'partners'. If she decides to do some kind of easy 'camwork', she will probably have also 'too-many-to-count' paying customers.
When a man falls for a woman like that, in real world, it can only end in tears, sorrow, trouble, problems and even in the best-case scenario, a horrible trap.
Sometimes even a 'not-techically-that-attractive-but-slightly-cute' woman can make a man's emotions open up with enough kind interactions and effective-enough presence of some kind.
..maybe nothing specific about the actress, but more like a symbolic expression of the character; meant to embody the typical 'unrequited love'-situation that can so easily open up a man's chest for emotions he didn't even know can still exist.
Once it hits ya, you can understand the title of the movie. If it has never hit ya, consider yourself lucky, and try to keep it that way.
This kind of 'there's something about her'-phenomenon can ruin lives.
But I am glad they never explained what that 'something' is in the movie, because that's how it is in real life. You never know what 'it' is.
You won't know if you will ever find out. The emotions only 'feel', they won't 'tell'..