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Over the past decade and change, the Marvel Cinematic Universe has grown into a behemoth force in the entertainment industry. But it did start with relatively humble roots, as Jon Favreau and company broke new ground with 2008’s Iron Man. Robert Downey Jr. and Gwyneth Paltrow led the cast, and were paired a ton of times throughout RDJ’s tenure as Tony Stark. Paltrow recently spoke to the experience of kissing her Marvel co-star… and it doesn’t sound all that fun.