Keanu Reeves gets tricked into a threesome in freaky trailer for erotic horror flick

The official trailer for Eli Roth's new thriller Knock Knock has arrived and it will basically scare you out of having sex for life.

Watch the clip above to see Keanu Reeves starring as a happily married father-of-two, who is lured into a tryst with some very persistent strangers (Ana de Armas and Lorenza Izzo).

Unfortunately for him the whole scenario is too good to be true when the women return the next day to torture him in his home.

Inspired by '70s exploitation flick Death Game, Knock Knock is expected to hit Australian cinemas in 2016.