take a pair of boxer briefs, cut off the legs, and cut a triangle in the back. just look at a picture of a jockstrap to get the shape completely right.
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Cut a triangle out of briefs or boxer breifs just measure ur butt first
take a pair of y fronts and cut half way from th waist downwards then get two pieces of elastic and stitch it to the sides
it's easy just take a pair of berifs then cut of the leg leave the crotch strap then make a triangle above the butt.
and that's how you mak as they say a penis ball sack