Doesn't sexy increases the sex_atk?
Also did you find per chance the files related to the clinic body mods?
Sexy has no influence on the sex attack stats.
I found three files fore body mods: AsVulvaMod, Mod_Sterilization, and Mod_WombSeedBed under \Data\Effects\States. These are not all of them, I think, just the ones that have an effect on sexy and health.
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Testing my hypothesis, it actually seems like the Nympho trait does increase sex attack as promised in the description, by 25 to be exact. That is not something you can discern by reading the trait_Nymph file and in general everything surrounding the sex attack stats seem to break the file structure.
Digging a bit deeper, it seems like those are handled in 25_Game_Actor.rb in \Data\Scripts\Frames.
Code:
tmpSexAtk = (self.stat["Nymph"]+self.stat["Prostitute"])*25
tmpSexAtkMax = 100+self.stat["Lilith"]*50
[...]
sex_Con = self.constitution/2
[...]
self.sex_mouth_atk= ([sex_Con+(@exp_mouth*(2+self.stat["Lilith"]))+tmpSexAtk,tmpSexAtkMax].min * [0.01*self.sta,1].min).round
I totally forgot that the Prostitute trait also gives 25 to the stats.
In any case, I yet have to determine what the cap for exp_mouth (I think it is 25 also), but you can reach at least 50 without CON investment with neutral personality. I need to make out a stat threshold at which you can suck of common enemies in one go; it is probably around 20, but I need more testing and more digging to be sure.