The "exclusive" designation in the context of Fourplay typically refers to its distribution model and intended audience. As a framework intended for adult-themed or mature content creation (hosted primarily on LoversLab), it is not available through mainstream distribution channels like Bethesda.net or the Steam Workshop due to content policy restrictions.
LL-fourplay (LL4P) is a foundational Fallout 4 Script Extender (F4SE) plugin hosted primarily on ll fourplay f4se plugin exclusive