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There is a blast like a cannon; Bob's crotch is seen smoking.
Something utterly trivial or ridiculous causes his ejaculation, such as Alice giving him a dirty look or someone saying the word "sex" around him.
Zig Zagged: Something exploded in Bob's pocket. This seems to be his lame excuse. He pulls out the ruined item, still leaking its fluid. Then there's a reason why it couldn't have possibly come from that particular trinket, so it must have come from his other one...
Averted: Nobody ejaculates onscreen.
Enforced: The work is an ad for a product designed to help men last longer.
Alice gives Bob a lap dance.
Bob is secretly trying to unnerve Alice into breaking up with him, so he stimulates himself beforehand in an attempt to stage a premature ejaculation.
Exploited: Charlie the Charlatan uses Bob's ejaculation issues to sell him a "miracle tonic" that supposedly helps keep him from ejaculating so easily.
Defied: Bob has a condom on before he arrives at Alice's place, or is taking medication or other precautions.
Discussed: "I swear, if she did that to me, I would come right here in my pants."
Conversed: "What real person has that little self control?!"
Bob becomes socially ostracized.
Bob loses a girlfriend.
Reconstructed: Bob's girlfriend deliberately teased him to that point with no-one else around.
Played For Drama: Bob loses, or has to fight hard for, a relationship because of it.