This might be the best-known bulge slider mod as it’s been around for a number of years now, first launching in 2019. With this mod you can adjust the size of your sim’s package by sliding the crotch area up & down in CAS. You might need to zoom in to get the right area; it might be best to adjust this when your sim isn’t wearing any bottoms so it’s easier to manipulate.

There are 2 versions of the bulge slider to choose from. V1 works for masc frames only. V2 is available for masc and femme framed sims, opening up more options for gender expression with your characters.