You fuck a female up the ass with a giant dildo. The ass is spread so as to create a crater like formation. This allows for the male to squirt his stuff, thus creating a pool of semen in the female's anus. The surrounding fecal matter of the asshole breaks off into the ejaculate goo, thus creating poop floaties.
Dude, did you hear? Tony walked in on his mother getting a Milky Way from her boyfriend.