File:Slovak Male Navel Innie Bellybutton.jpg - Wikimedia Commons
Young topless man points with forefinger to his fat stomach belly button islolated on white background - concept getting rid of belly fat, overweight, diet, lifestyle, health, weight Stock-Foto | Adobe Stock
The curious truth about belly button fluff - BBC Future
Why men have more belly button lint and other things you need to know today - al.com
Anatomy For Sculptors ® on Twitter: "A male's navel is often more horizontal, and a female's navel is more vertical. Males' bellies are usually flatter, have a visible Inguinal crease, and the