Bisexuality was invented by commercialism. It was originally about getting aroused while shopping. Like feeling the nether tingles while looking at a toaster - in other words, a sarousal (sale + arousal). It was branded Buy-sexual by the eggheads in charge. But what they didn't expect was the growth of discount stores and coupons created nonstop sales, which cause a explosive sexual energy.. The power of this energy went beyond just finding 20% discounts, and the sarousal transformed into just regular arousal, causing test subjects to release their sexual energy by humping everyone, male or female.

Somewhere down the line, because of good marketing, Buy-sexual became bisexual, and that's how we got here today.