This has probably been done before but... Here's a few of mine: nonoxynol-9 will numb your tongue and it's not a pleasant experience. cum mixed with gum (specifically Wrigley's Extra spearmint) equals disaster involving bits of said gum stuck in a guy's pubes. And watching him hover naked over a dim lamp while cutting bits of gum out of his bush with tiny manicure scissors is not attractive. I once bounced too hard on a guy and he was convinced I broke his dick. We actually called my mother since she's an FNP and asked her what to do. She told us both to calm down on the "hard sex." Ha! Anyone else? No judgment here.