-Lust damage, probably works something like nonlethal damage.
-Lust 'hp' could be equal to normal hp, which would be simplest. Alternately, 'lust' hp could be calculated using Wisdom modifier instead of Con.
-Alchemist discovery that allows bombs to deal lust damage will probably be a thing.
-Whips can deal normal damage or lust damage when used by someone proficient. Attacks normal AC either way.
-Open to collaborating on designing spells that deal lust damage.
-Lust Armor Class: Will save + 10 maybe?
-Teasing: lust damage equivalent of an unarmed strike. Uses Cha mod instead of Str or Dex for attack roll and damage.
-Can probably work with the player on what kind of gods and domains would fit the setting.
-Aside from the classic Pathfinder races, something like the Blissborn from the Shards of Eros
campaign setting might be available, though I might not use them quite as written.