As sick as it is, the actuality of "gift giving" seems entirely plausible to me. You have people who thrive on the thrill of raping and killing other people without remorse, which has been a sad fact throughout human history, and this "gift giving" seems to be an extension of that. Perpetrators probably feel as if they're not as evil and ruthless as someone who might smother and dismember their rape victim after the act, but they're actions are no less severe.
I'm sure it's a fringe group that is into it, and there are surely some extremist Christians that use this subject to further their anti-gay viewpoints, but it's definitely not as black and white as being a "gay thing", or on the other extreme, a farce spun by Christians. There are surely hetero "gift givers" out there as well.
I wonder also, if theres a weird offshoot of the biological paternal instinct at work among those who may be less educated about the gravity of the aids epidemic. For instance, part of the thrill of hetero sex without a condom is the thought of knocking your girl up. While it's normally not something you want to do every time you have sex, in the heat of the moment theres a certain underlying biological desire to actually procreate. Everything about sex- from a girls desire to look attractive, to a guy's desire to impress a girl- all comes down to procreation, so it's understandable that theres a thrill involved in the thought of actually going through with it as opposed to "practicing" as a couple does during safe sex. Gay people are denied this aspect because they know that no matter what they do they will never get their partner pregnant or get pregnant themselves. In a few of those posts they reffer to gift giving as "knocking up". Perhap's this is a weird perversion of the act of actually impregnating a girl, transposed into a homosexual situation.
Sorry for getting all Frued and shit, just throwing something out there. No matter what their motives are though, it's no more justifiable than raping and dismembering someone.
Oh, and what happened to the "n" in damn? Did I miss something?