Caliente's Beautiful Bodies Enhancer is a mod for Fallout 4, created by Caliente and Ousnius.
CBBE replaces the vanilla female body that all adult female characters (player and NPC) share, with one that is fully customizable with the BodySlide tool. By default there are three nude options available that don't require anything but installation, as well as lore-friendly underwear styles for these body shapes (using Beth's own unused underwear meshes).
These meshes have a total of over 21k vertices - compared to the vanilla body's modest 1750 - for optimal smoothness. In tests there have been no reports of these high-poly meshes causing any slow down, but may still be too much for weaker systems to use, so be warned. Also, as a separate download, are a selection of vanilla outfits converted to CBBE and BodySlide.
Add the following lines to your "Fallout4Custom.ini" file located in "Documents\My Games\Fallout4":
(No, that's not a typo. You also don't need to add it again if it's already there; doing so is both redundant and silly.)
Download the file and extract the options you need into your Data folder using 7-zip.
Mod Organizer/Nexus Mod Manager
Install the archive with Nexus Mod Manager like you would do with any other mod.
Report problems with download to firstname.lastname@example.org