Considering that he was sweating bullets, probably like the real thing.
This question is making me fully autistic, so I would probably point out most toon items act like the real shit till they don't, depending on their goofiness, and Jessica is a pretty serious gal. And now I am picturing dating a less serious toon gal and her suggestively pulling her tits out only for them to keep bouncing cause, while it killed the mood it was funny.
Dating a toon would be the worst. Imagine your boyfriend helicoptering his dick, now imagine your boyfriend flying around the room because he got really into the gag.