Play It Again, Sam, by Samantha Kane
Book One of the Cougar Challenge series.

Monica Allen has always been attracted to younger men. She even married one. But after the divorce, she thought she was through with them for good. Then she meets a group of ladies at RomantiCon, and they form a blog celebrating younger men, Tempt the Cougar.

After another lonely Friday night, Monica challenges her friends to each find a younger man to make their fantasies come true. She doesn't have to marry him – been there, done that, threw away the t-shirt. But for a night of hot sex? Hell yes.

But Sam Lincoln refuses to be just a fantasy. He's a graduate student with a yen for older women and he may have just found the one to make his own fantasies come true. With a little help from his roommate Josh, Sam fulfills Monica's deepest desires. Can he convince this sexy cougar to give him a chance at happily ever after?

Beauty of Sunset by Lynn Connolly
Book two of the Cougar Challenge series.

When Edie Howard meets cosmetic surgeon John Sung, she can't think of anything except getting the younger man naked. Her friends on the Tempt the Cougar blog remind Edie of her promise – to seduce a younger man. It's time for Edie to take action.

Dr. John Sung takes one look at Edie and knows he can't operate on her. He signs off as her doctor and makes her a bet – if he can make her love her body as it is, she won't have any surgery.

John's bet involves close examinations – and torrid, sleepless nights. Their passion is far more than either expects, and John begins to wonder if he'll ever get enough of this woman. Edie just counts her blessings and hopes their age difference won't drive John away.

Winters' Thaw by Dalton Diaz
Book three of the Cougar Challenge series.

OR nurse Elizabeth Winters is forty-one, divorced and determined to figure out what all the fuss is about sex. Her ex spent over twenty years crushing her sensuality and it is long past time for release. Literally, dammit! In her quest, she befriends a group of women her age who admit having a passion for younger men – and thus begins a challenge…

Thirty-year-old engineer Kevin Springer loves solving puzzles and "Elle" has him aching to fit the pieces. The more he gets to know her, the more intrigued he becomes, especially in bed. He quickly realizes he wants more than her offered no-strings-attached, wild sex, but convincing her to take a chance on a relationship isn't going to be easy.