This is a set of default replacement meshes to give a noticeable bulge to briefs, boxer briefs, and swimming briefs.
I have also made default replacement textures for the underwear to make it look like there's actually some junk inside and to make their butts more callipygian. Hopefully, it's actually worth it to look at sims in their manties now.
This package *ahem* comes in three flavors: subtle, medium, and large. Personally, I use the medium in my game. You can choose only ONE default size. Enabled for teens, ya/adult, and elders.
Note: the default textures are in a separate download from the meshes (on the bottom of the list). Make sure you grab them. They make a big difference in the appearance!