Get your mind outta the gutter... or give those with Vow of Chastity immunity to this power.
I'd say that this is a very interesting power. However, a -4 penalty for an HOUR? Why? BoED have TONS of elationlike supernatural effects, and none of them have any kind of drawback when it ends. Also, would you be able to Distill joy from someone under the effects of this power? What would other Elation spells and powers do? Negate the penalty, negate AND give the full bonus, or just give a bonus to offset the penalty? In addition, I'd suggest making the sadness curable by Hearts Ease.