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Thanks Conrad, Dorian and Paul.
Mature male sea lions are like Sumo wrestlers in that they might be fat, but they are also heavily muscled and strong. In the case of the sea lions: the fat protects them from the severe bites they get from competing males.
I don't know about Sumo wrestlers, but with sea lions, all the girls like the winner- fat or not . Strong fathers means strong babies. And that means better chances for survival.