A trick we are all familiar with is when one takes a cherry from their midori sour and ties the stem in a knot using only their tongue and teeth. This trick inspires the party to imagine that the performer is a very bored person with ample amounts of time to learn mundane tricks, and will likely be grateful for any company.
A party I attended had the appropriate ingredients for party tricks to break out at any moment: men with beer and women in want of beer.
The scene featured my friend, Cameron, sitting beside me with a bottle of beer tucked between his thighs. His girlfriend appeared to him, drawn forth by the call of weak alcohol. An idea was all at once conceived between expressions of the eye, and she knelt on the floor with the intention of drinking the beer from the lewd location in which it was placed.
Tipping the bottle for a drink would require adjusting the bottle into a flaccid, and thus less alluring, position. A moment's hesitation revealed that there was some confusion as to how to do this in a sexy manner. With entirely diplomatic and helpful motives (do not question me) I suggested, "You should put your lips over the mouth of the bottle and suck hard enough to lift the liquid."
No sooner suggested than it was done. The dame placed her mouth over the bottle, and her cheeks hollowed. The party stilled and everyone watched in intrigue at her earnest attempts.
Unsurprisingly, the suction of her mouth was unable to conquer Earth's gravitational pull on the beer and she was unable to imbibe the beverage.
Cameron admitted that had she been able to, it may have been more of a terrifying display than an alluring performance. He hypothesized that had her suction pressure been so immense, felatio could very well be an excruciating act administered by the most terrible vacuum/plunger to exist. His semen might have been extracted immediately with one soul crushing suck.
Of course there are multiple horrifying alternatives to imagine. Currently the internet provides few helpful sources for what will happen to a delicate appendage such as a penis in a vacuum chamber.
The best case scenario is played out in this video featuring a man formed from marshmallows, expanding rapidly within a vacuum. He reaches his maximum girth at which point he pops and deflates. Do not let the content smile drawn on his face deceive you, no person would be smiling in the event of a sexual favor becoming a sadistic act of science.
As you have no doubt realized, this entry is not a sexual examination of party tricks. (I may venture to say it is a scientific analysis of a failed innuendo.) On the offhand chance that this is an extremely titillating party fetish of yours, I leave you with the knowledge that there are many videos of marshmallows in vacuum chambers, and I ask that you use this knowledge for good.