Actors will equip tongues and make ahegao faces during sex ("Ahegao" is when people make silly faces and stick out their tongue during sex. It's a Japanese word because of course it is). You can configure who gets tongues and when in the MCM menu.   Requires Mfg Fix, Papyrus Util, and SexLab (tested on Beta 7 and Beta 9, should work on 8 too). Requires HDT if you choose the HDT version (you should) plus SkyUI for the MCM menu, and SKSE.   For SexLab, this mod gives you lip sy