Guys, Why are guys so cuddly when they're sick?

Okay, so my boyfriend is one of the most cuddly people you will ever meet. He is literally a snuggle monster. Down to cuddle all the time. But when he's sick, he becomes extremely clingy and doesn't even like when I leave the room. Don't get me wrong, I think it's absolutely adorable and I love it, but I have to ask. Why do guys get so snuggly when they're sick?
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Okay, maybe I termed this too loosely. Why do SOME guys get really cuddly when they're sick? I know not all of them do.
Guys, Why are guys so cuddly when they're sick?
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