This Girl by Jason Hytes

Young and untouched, she wanted to be wicked for a weekend...and found that she was always weak and willing.

'There was nothing - neither man nor woman - to tame the latent hungers that possessed This Girl'.

From the back:

She thought she had found the man she could love... then she met his sister. She tried to resist the strange world that Mona unveiled... but she succumbed to Mona's lush beauty again and again... to the masseuse at the beauty salon... to the lecherous painter... to everyone who touched her... and found that she wanted them all.