Fantasy
When commitment-phobic fraud-cop Jewel busts a fake sex therapist, she accidentally releases a sex demon from his "treatment bed". Randy was once an English lord who was bad in bed. His mistress complained, he taunted her, and she cursed him to "Satisfy 100 women." Jewel is number 100!
It's Raining Angels and Demons by Jennifer Stevenson;
Act One, Wish One by Mindy Klasky;
Few Are Chosen by Storm Grant