For Khloe Kardashian and her hubby Lamar Odom, timing really is everything!

On Sunday's premiere of the couple's new E! reality series, Khloe & Lamar, Odom, 31, gripes about having to schedule sex with his wife according to her ovulation schedule in the hopes of getting pregnant.

"It's a little weird when it comes to [scheduling] sex," Odom says, as Kardashian, 26, and her BFF/assistant Malika go over the week's itinerary, which includes a book signing, dinner with Kardashian's mom Kris Jenner, and of course, lots of lovemaking.

While Odom is hesitant to plan their time in bed -- "I like to pop off spontaneously," he admits -- his wife is much more enthusiastic about the process.

"Wednesday, Thursday, Friday -- let's bang it out!" she enthuses.

Check out more from the couple's new series in the clip above and tune into the full episode of Khloe & Lamar Sunday at 10 p.m. (EST) on E!.

Credit: Us Magazine