I've always pictured J-lo being better suited for a Black or Latino man. Her and white men aren't compatible, I thought her relationship with A-Rod was probably among her best couplings that we know of.
Another reason as far as why her relationships never work out, I'm thinking it could be an intimacy issue...you know how most couples whether they're married or just dating have sex EVERY NIGHT or at the very least EVERY OTHER DAY of the week?
Well, J-lo comes across as the kind of woman who only has sex a few times a MONTH and I could imagine that being one of the main reasons behind her failed relationships/marriages. She doesn't seem like the kind of woman that likes to have sex very often and being a woman of her caliber, in regards to looks, having sex in a relationship is just part of the equation but that's probably something she's not interested in doing...at least often or if ever.