Hey Schmokey I always wear boxers but when it comes to the test day always wear nut hugers it serves a couple of purposes first u need them to hold the botlle in place and the second reason is for insulation the bottle that comes in the qf has a regular cap on it then in the bottom of the box it comes with a squirt cap do not use the squirt cap all you have to do is set the test cup on back of toilet open the botlle of qf and pour it in then maybe if you really have to pee then do so in the toilet also I put the qf under bhind my nuts near the gooch temp held up good there and was comfortable walking