However, you shouldn’t trust every “fact” you find on the internet, because porn stars say they use the face cleanser Cetaphil, since it looks exactly like the real thing. a hydrophilic bulking agent that’s used in super old lubes, sci-fi films as alien slime, and old people who suffer from irregular bowel movements (it’s a laxative if you eat it). Curious about what fake cum is? According to the internet, it’s methylcellulose, a.k.a.