By Gigi Engle I’m going to go out on a limb here and guess that blood wasn’t on your Sexual Fluid Bingo card, but it should have been. In case you haven’t noticed, blood is pretty hot these days. Take Machine Gun Kelly and Megan Fox. After they got engaged, those two weirdos (allegedly) drank each other’s blood. And while whatever blood-based proclivities those lovebirds may enjoy beyond a bloody post-engagement toast remain unclear, some people are into blood during sex. If you happen to be among the blood-curious, the internet is obviously rife with blood-fetish porn. But good, quality facts…