Usually Friday or Saturday. It depends on the movie.
Also, I don't know about your tastes in shows or how risque your sense of humor. But, Showtime has some GREAT shows that DH & I actually plan our evenings around:
Weeds- I have loved this show since it's first episode. It's not for everyone, but it is very dark humor. Mary Louise Parker stars, and she has won several awards for her role as Nancy Botwin.
Californication- This stars David Duchovny in, I think, his best role. He is a writer living in L.A. who had his book sold to be a movie and is now considered a sell out. It's highly entertaining, but again rique.
DEXTER- I LOVE THIS SHOW. Dark humor, but great drama.
The Tudors- Period drama based on Henry VIII and his many loves and wives.
And a personal favorite: Penn & Teller BS.
Their lineup is like HBO in it's heydey. They have some really good shows.
Hope you enjoy it, and sorry if I went off topic a bit. It's unusual to find good t.v. without paying for it anymore!