Using some of the suggestions posted, I have adjusted the skill yet again. I hope it makes more sense now.I know I've already posted this rule several pages back, but I've made some changes to it so I thought I'd post it again. I was inspired some time ago to create the Seduction Skill, due to reading Frank Dux's autobiography where he describes how he studied the art of seduction as part of his CIA training, then goes on to describe how it actually saved his life in the field. Now, I've been playing Pathfinder for nearly a year now, so I have tweaked the rules for use in the Pathfinder Game.
Ability Score Adjustment: Charisma
Class Skill: Bards & Rogues get Seduction as a Class Skill
Racial Adjustment: Elves get a +4 bonus to the Seduction Skill. Half-Elves get a +2 bonus.
Feats: The Persuasive feat grants a +2 bonus to the Seduction Skill (increases to +4 when there are 10 or more ranks on the skill). The Skill Focus feat grants a +3 bonus to the skill (+6 if there's 10 or more ranks on the skill).
Skill Synergy: Having 5 or more ranks in the Diplomacy skill grants a +2 synergy bonus to Seduction.
Traits: The Charming trait grants a +1 bonus to the Seduction Skill.
Untrained Use?: Yes
NPC Races: Alu-Fiends, Dryads, Erinyes, Incubi, Succubi, and Wood Nymphs all get a +4 racial bonus to the Seduction skill (all except the Alu-Fiend, who only gets +2 due to being half human). Furthermore, they also get the Seduction skill as a Class Skill, regardless of their actual character class (thus a Wood Nymph Druid would get a +3 bonus to Seduction as a Class Skill, in addition to her +4 racial bonus).
NPC Classes: Bar Wench, Belly Dancer, Courtesan, Harem Girl, and Prostitute all get Seduction as a Class Skill.
Mechanics: The seductress must make a Skill Check on a d20, adjusted for CHA, Ranks, Class, Feats, Race, and Traits, etc. The intended target then makes a Will Save, adjusted for WIS and Misc Modifiers, using the seductress' Skill Check as the DC. If his Will save is equal to or greater than the seductress' Skill Check total, he had successfully avoided being seduced. If not, then he has fallen victim to her charms.
Modifiers: Because the Seduction skill can gain modifiers far more quickly than the Willpower Save, there are several Misc Situational Modifiers to balance things out. Most provide a bonus to the Saving Throw, some give a penalty. The following are the modifiers I came up with. Feel free to add some of your own to the list, or adjust the numbers to your taste.
Has taken a Vow Of Chastity: +10
Heterosexual member of the same sex: +10
Homosexual member of the opposite sex: +10
Is a heterophobe/homophobe: +5*
Happily committed to a long term monogomous relationship: +10
Committed to a long term monogomous relationship: +5
Morally against premarital/extramarital sex: +5
Strong work ethic: +5
Member of a different race than the seductress': +1 to +5**
Member of a race hostile towards the seductress' race: +10
From a different culture than the seductress': +5***
Has ranks in Seduction: +1/rank****
Under the influence of drugs and/or alcohol: -1/drink and/or dose of narcotics#
Is from a culture which practices polygamy: -5##
Is part of a hedonistic religion/society: -10
Has not had intimate contact for several weeks and is very . . . lonely: -5
Has not had intimate contact for several months and is very, VERY . . . lonely: -10
*This can only be chosen as a modifier if the DM chooses homosexual of opposite sex or heterosexual of same sex as a modifier.
**This is up to the DM's discretion. A hobbit seducing a human might not require an adjustment, but a female dwarf trying to seduce a male human might (most heterosexual men don't want to make it with someone with thicker facial hair than they have).
***DM's discretion. What's considered seductive and alluring in one culture might be considered rude and vulgar in another.
****This is due to them being able to recognize their seduction techniques, as they use them themselves.
#This number can go up at the DM's discretion, especially if the specific narcotics being consumed are known to increase one's libido.
##Alternatively, this could be changed to "No Modifier" at the DM's discretion. It was added to try and maintain a balance between positive and negative conditional modifiers.