During sex, the man cums half his load into the girl while saving the remainder to pull out on the girls hips and general bikini area. This gives the illusion that the man pulled out; which makes the girl happy because she can only handle so many morning after pills per week.
By now, months have passed and you have been out of the picture for some time. Meanwhile, the woman gives birth... and you, just as Houdini, have long since disappeared.
A: That guy Maria hooked up with at Rick's Steakhouse Pavilion last winter pulled a Houdini Bikini...
B: She said he pulled out but c'mon, that's how effective the Houdini can be if properly executed.
A: Precisely, and that B, is where single mothers come from