I was looking at Orgasm (the spell; get your minds out of the gutter), and I thought of a more subtle spell:

Nature's Call (Realistic, Single-Sense)
Type: M • Range: LOS • Duration: S • DV: (F ÷ 2) – 2
Halftime (Realistic, Single-Sense, Area)
Type: M • Range: LOS (A) • Duration: S • DV: (F ÷ 2)
This spell induces the strong feeling of the need to use the bathroom. While it's great for pranks at school or camp, this spell is also a great way to distract your enemies. Each net hit scored by the caster applies a –1 dice pool modifier to all of the target’s actions as they contemplate a potty dance. At the gamemaster’s discretion, a character who suffers a dice pool modifier higher than his Willpower is convinced of their need and may leave their post (if any).
Nature's Call affects a single target, Halftime is area effect.

If there are any more new spells out there, please share.

...had a player develop a "morning after" spell in my last campaign. Gave his character bonus Karma for it.

Heh, you should make it so that if the caster gets too many net successes, the target relieves his/her-self. Immediately.