In the last 15 – 20 years, hip hop stars have made exposing your underwear a common and cool trend in America. Sagging pants began in American prisons, where oversized uniforms were issued without belts to prevent suicide and their use as weapons. The style spread through rappers and music videos from the ghetto to the suburbs. Now, everyone does it. This infectious style of pants wear and underwear exposure is displayed by twink skater guys, trendy streetwear fellas, pastel colored polo wearing suburban kids and even Japanese school boys.
Is it ok to show a bit of underwear or is it vulgar? I would be truly excited if I wear walking down the street or in a club and I saw some guy exposing his Disco Valante underwear to see…but I have a personal and professional interest in free publicity.
Some conservative American communities have gone as far as rewarding fines to guys who expose their underwear.
Is there something arousing in seeing a hint of waistband and fabric rising atop a guy’s jeans and exposing a closer look at his onion booty?
Or has this fashion statement outlived it’s time and should guys return to non-low waist trousers that give aid to such underwear exposure? Or does it really depend on how hot the guy is if it is acceptable? 
The last one. Definitely, that one! The hotter the better!
Since men’s underwear has become a fasion statement/item, waistbands will remain more or less visible. How much depends on your style