Why is this a thing we are all just realizing. Bi-sexuals, all of the genders, just freaking love to tuck in their shirts. It's honestly a phenomenon that needs to be researched. Maybe we crave the stability of having a clean appearance because everything else can get out of hand.
Being bisexual can sometimes mean having very confusing types. Sometimes they go after girls and boys who look the exact same, or ones who straight-up look like they could be their twin. It can be very overwhelming either way.