(Cover) - EN Showbiz - Justin Timberlake makes a real effort to find "rhythm" with his female co-stars while shooting sex scenes.

The 30-year-old superstar singer and actor has two comedy films coming out this summer that are both overflowing with steamy sequences.

Justin visited Jay Leno on The Tonight Show yesterday evening to promote both Bad Teacher, which co-stars his ex-girlfriend Cameron Diaz, and Friends with Benefits, a film also featuring Mila Kunis.

Although Justin is friends with both Cameron and Mila, he admits that it was awkward to get hot and steamy right at the beginning of shooting.

"We said we'll put it at the end and it gave us time to get a little bit of a rhythm with each other," Justin said to Jay. "That was probably the wrong choice of words."

Justin enjoyed the experience of working with Mila who he has been romantically linked to in recent months - and has nothing but kind words to say about his co-star.

[Friends with Benefits is] a heart-warming film," Justin laughed to Jay. "It's straight up comedy starring myself and the lovely Mila Kunis. Yes, there's a lot of sex in it."

Filming sex scenes with his ex Cameron was equally pleasurable.

"[Cameron's] lovely," he said. "I obviously know her pretty well."

Bad Teacher is in theatres now and Friends with Benefits will be released next month. (C) Cover Media