Normally, in order to produce this result, the woman must lie down on her back with her head off the side of the bed. The male approaches and from behind her head, such that his shaft is perfectly aligned with her throat.
*WARNING* If she chunders, prepare to roll her over or else she will drown and die. *WARNING*
1. A term used by baby boomers as slang for making out, the term has more recently come to describe penetrating someones traecheotomy and/or other neck hole.
A: "Yeah and I blew a load right in her stoma."