Transparency: I only know Harlequin Romances from the covers in the book store. Honest.
As the mother of a friend of mine once told me...
Get the ones with the RED covers, they have all the sex!
The best source of reliable information is romance novels, which you can find in better bookstores and supermarkets everywhere. To know the books I mean--the cover always is a picture of a handsome and of course brooding man embracing a woman with green eyes and a bosom that is clearly heaving, sometimes most of the way out of her dress. The title is always something fairly humid, like Loins of Passion.:
"As Sabrina gazed upward at Baron LeGume, whose dark, brooding eyeballs were turgid with passion, she felt tormented tenseness of his throbbing, pulsating malehood, and she knew, with a knowledge borne of knowing, that she could no longer hold back the surging waves of passion that washed over her, like waves of something, as his brooding throbbing pulsating highly engorged lips sought hers, not that she wanted to hold them back..."