i don't really have this issue, perhaps you should buy/wear some underwear that fit... My boxers stay put while riding.
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Hmmm, you must be a female.
:needpics:
:justkidding:
:rof::rof::rof::rof::rof::rof::needpics:
:justkidding:
:rof::rof::rof::rof::rof::rof::rof:
:wav:
Here's the overall solution, don't wear any underwear. Go naked, seems like the naked way is pretty popular for certain members.