It's an adolescent dream and in reality I think groupie stuff is very different for women. But it's the idea, likely not true but one can wish, that all these women pop stars show their midriffs because it's an erogenous zone for them. Their navels become famous and therefore if they hook up with fans, the hope is the fan will give their famous navels some attention. Like Madonna, for instance. I like to think that the men she hooked up with made it a thing to lick out that sexy belly button of hers, either because they were attracted to it or simply because it was everywhere, and that she did this by design.
I like this idea because I love getting my navel licked and it would be a sexy, wonderful dream come true if I was famous and somehow became known for having a sexy navel, the kind that all my female fans lusted after. We're not really living in a world where a man's navel is really considered an object of desire for women. Maybe if it comes with a toned stomach, we can go there. But generally, a man's navel is not considered sexy. And with my firm but somewhat rounded belly, my navel often doesn't get a second look until a woman discovers what it does to me when she sticks her tongue in it. So it would be a blissful existence to not only have women throwing themselves at me but to have them zero in on my navel. Crowds of women trying to stick a finger in it at appearances, body shots from beautiful women in public places, women bragging about having gotten to lick it, paparazzi photos of young starlets burying their tongues in it at parties, college girls masturbating to fantasies about licking the sweat from it.
The reality would probably suck but that's why it's a fantasy. And I've been fortunate enough to find lovers who, if they weren't already attracted to my navel, at least made it a focus when exploring my body. Still, a strange woman taking me aside and thoroughly exploring my navel with her tongue and then blowing me to completion just so she could say she did. Maybe even just one time, that might be really cool.