Agos (2005) aka Flow
A husband leaves his wife alone to work in another city. One night, the wife goes out with a friend, gets drunk and starts making love to a male stripper, thinking it’s her husband.
Thinks It’s Her Husband
There is a Ghost in My Bed (1981)
A couple stays in a castle for their honeymoon. The wife gets screwed by the ghost of a horny baron who is haunting the castle.