Nymphomaniac

Nymphomaniac starring Shia LaBeouf and Stacy Martin featured the real sex,

Love

Actors Karl Glusman and Aomi Muyock shot real sex, which director Gaspar Noe had admitted that the sex was not choreographed.

Little Ashes

In Little Ashes, Robert Pattinson had admitted to masturbating in front of the camera in order to make it realistic.

Intimacy

Intimacy featured Mark Rylance and Kerry Fox who agreed to participate in unsimulated sex scenes, such as the oral treatment

9 Songs

9 Songs featured a real intercourse between Kieran O'Brien and Margo Stilley, both penetrative and oral sex.

Wetlands

Wetlands featured Carla Juri as a hypersexual teenager who is seen engaging in several lewd sexual activities

Lie with Me

The sex scenes between Lauren Lee Smith and actor Eric Balfour in Lie with Me were actually unsimulated.

Penthouse Magazine founder Bob Guccione wanted to make a movie with unsimulated sex and it turned out to be Caligula, which stars Helen Mirren and Malcolm McDowell.

Caligula