Jennifer Lopez is getting wet 'n' wild with a man who's tall, dark and sexy -- but it isn't hubby of six years Marc Anthony!

In The Back-Up Plan (available on Blu-ray and DVD now), Lopez plays a NYC pet-shop owner who decides to get artificially inseminated -- the same day she meets the man of her dreams (actor Alex O'Loughlin).

Watch the actress, 41, try to impress O'Loughlin's character as she flirts with him in the trailer (above)!