An alien being comes down to Earth, morphs into a human form in order to understand our species & then begins a race against time to meet with his star-faring rendevous party before the government military can get it's hands on him/it. But not before he/it can get a girl pregnant.
Simply put,
this movie is E.T. for adults.
Or at least, it's for those of us whose mind's are mature enough to understand that when it comes to traffic lights, red means "stop", green means "go" & yellow means "go very fast".
8/10