I am just trying to hear other advice of tucking methods that might help in this situation. That said is I have an to secure the scrotum. It seems over the course of the day they spread and lets say escape. I do use a thong gaff that is also under bikini bottoms(both of them are a size small).  Any help will be beneficial.

 Hello jen,
  I have severe acid reflux so gaffs are out for me. As anything tight around the waist makes that worse. What I do is called the carmen carra style. I use kinesiology tape, 5, 5 and 1/2 inch pieces. First you push your testys up in ,and fold the penis down ,then take the loose skin, the scrotum and fold it over making lips leave the tip of it out so you can pee. The tape is heat activated , I apply the tape in a x ,starting at the bottom working my way up. Then I do another x starting a little lower overlapping just a little, and finish with one across where my testys bulge abit to snug things in. You can pee like this but will have to wipe. I don't like to keep tape on for more than 24 hours so to take it off I use cold water in the shower, take it off slowly. Dont use warm water as this is heat activated that will take off skin. This tape is water proof I hear from other girls that ya can swim with this on. This will take practice and isn't the easyest thing to do but it works for me , it takes me less than 15 minutes to put this on and is just part of my daily routine.
   I hope this helps ya.
        Hugs Abbie

Hi Jen. I use Lycra/spandex panties. I get a size smaller than my actual size. I tuck everything back between my legs and pull up the panties. When you do this the testes go up into your body by themselves. This method works great for me. I can wear anything and have a totally flat crotch. It's not the most comfortable thing but you get used to it.
Julia