This requires extreme precision and potentially a release waiver.
When you are fucking somebody doggy style you pull a plastic bag over their head cutting off them from air. You wait to cum until the very moment your partner is about to pass out, then pull out and stick your dick through the bag and as your partner gasps for air, you shoot your load in their mouth.
I'm on trial for manslaughter because when I was doing the Hungarianriver diver things went real bad.
During a blowjob, the male partner shoves his dick as far as possible down the womans throat until she begins to exasperatedly gag, then urinates with a powerful jet stream. The woman then proceeds to gargle it into a fine mixture with her saliva, then spits it out into her hands, and lathers her body with it.