@Clain: It is good to see that you have about done with this, a number of the spells seem fun and appropriate to my eyes. Below are my comments on some of them, but keep in mind that they are just my thoughts.
Fertility: Are the effects of this spell stackable if cast on both the would-be father and mother?
Heterophobia: The duration listed is "10 minutes + 1 round per level" which seems rather odd as it mixes minutes and rounds. Is this simply a mistake or is it this way for a reason?
Ilruna's Sexual Leash: The duration should probably be listed simply as "Permanent (see text)" with a note in the text that if you do not bring the target to orgasm within ten minutes the spell ends. Additionally, do you really mean to make this spell drive any target insane or asexual within two weeks?
Impregnate: I think that the duration for this should probably be 'Instantaneous'.
Irnar's Polaroidic Pregnancy: Would putting the duration at 'Nine hours (see text)' make more sense? As it is, I can see people arguing that one casting of this would permanently reduce the time of any pregnancies that the target might have in future...
MacFaileas’ Virtuous Ward: I just have to say that I like this spell...
Nymph's Beauty: Another nice spell which I can imagine would be handy in more normal campaigns. Though I can't rid my mind of the dissonance caused by the mental image of some scrawny old mage using the spell.
Obsession: You seem to be reitterating the
lustful condition here.
Perfect Beauty: There is a typo of sorts here I think. 'Immediately upon viewing you, all creatures must make a Will save, with
success indicating that they never see you in your normal state.' Don't you mean failure indicating that?
Sex Change: Does the confusion/insanity effect last for the entire duration of the sex change? You may want to state this outright.
Sex Slave: Again, the reitteration of lustful. Also, you might wish to make it clear exactly how this is stronger than, for example,
obsession.
Skank: See the note on
Obsession above. You could replace most of the text with 'The target becomes
lustful towards all creatures of their romantically preferred sex within sight.'
Slap: Another spell which is fun in its own way... Can you choose where you 'slap' a target?
Truth or Dare: You might wish to move this up a level and give it a longer duration. 5 minutes per level isn't that much for this sort of thing.