I realize the personality traits do more than pump stats, but I am simply pointing out how wildly unbalanced Nymphomaniac bonuses are compared to the other two personality traits.
Nymphomaniac gives you 25 Vagina/Anal Skill. Every point of CON is 0.5 Sex Skill. It would take you 50 CON to give you the equivalent 25 Sex Skill.
By comparison Tough gives you 6 ATK, and each COM is worth 0.5 ATK, so Tough is worth at least 12 trait points added to COM.
Again, this is ignoring the other affects they add, as well as the effects of enemy defenses, but my point is that choosing to forgo Nymphomaniac as opposed to Tough or Timid for melee and magic puts you at a massive disadvantage if you wanted to pickup Weapons Expert or Mana Control for a mixed build.
If I wanted a build that could use Weapons Expert and Mana Control I can easily ignore Timid and Tough traits without needing 50 trait points to make up the lost damage potential.