Cameron Diaz on Sex Tape role

Los Angeles - Cameron Diaz spent days with Jason Segel's "package in her face" making Sex Tape.

The pair star in the comedy series about a couple who video themselves recreating the Karma Sutra - a famous ancient Indian sex manual - only for it to go missing, and filming the initial scenes required a certain level of intimacy between the co-stars.

Cameron told People magazine: "[We] got to know each other very well. Our day was, 'My butt is going to be in your face, your package is going to be in my face."

Despite the raunchy subject matter, the health conscious star says the shoot was one of the most fun she's been on.

She added: "[It was the] funniest job I've ever had. It was highly athletic. Jason and I had to keep our strength up."

The Bad Teacher star has recently written The Body Book and through learning about her body she recently urged women to take better care of their private parts and treat their genitals like "beautiful flowers".

She said: "We think the vagina is on the outside. I say grab a mirror and play along. Get in there.

"Learn about it. You're supposed to treat it like the beautiful flower that is, the delicate flower that it is. And you're supposed to nurture it in all the ways that it needs nurturing. Watering it. Fertilising it. It needs nourishment. It's hungry."