I got to say I disagree with that because in situation where your looking to just have a quick fling with a chick it works, they like it and their isn't a relationship long enough for you to be a "pathetic whimpering lost puppy". Even if it is a more serious relationship its used more as a little "saying" that's easy to finish of a txt, to actually say it that would be a diffrent story.
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"love ya babe" isn't something that the kind of guys I like would say. It all depends on the girl. There's nothing wrong with putting hugs and kisses at the end of a letter, it doesn't make a man seem unmanly at all, just more appealing in my opinion.