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Hi guys,

I am also looking for a classic film (70's or 80's). What i can only recall is the story is happened on a streamship (all the shipman & passengers are all girls) Two guys dress in women and get on the ship then start enjoy. After that few pirates get on the ship and took the control and played some girls, inculde the captain. Finally two guys saved the whole ship & girls.

Sounds like "SEX BOAT", in which case it's a US film, nor European. See:
http://www.iafd.com/title.asp?title=Sex+Boat&year=1980
Here's a plot summary:

Loni Sanders comes home and husband Kevin James is waiting for her with Mike Ranger. He tells her he knows they fucked around on him, and forces them to screw while he watches. Then he kicks him out and takes her outside, ties her up to watch while he does neighbours Copper Penny and a blonde. Then he brings her to a boat for an all-girl cruise. Aunt ?? brings niece Sylvia Benedict to the same ship. On the way she masturbates for chauffeur Turk Lyon to watch.
Randy West and Turk Lyon sneak aboard dressed as women and at night they sneak into the dorm where Turk starts eating the sleeping brunette. Hillary Summers wakes up and joins them. When they find out he's a guy they take him into the next room to screw him. And Randy does Terry Dolan. Next morning Kelly Nichols and Donna Dennis are brushing the deck and start a water fight that turns into a lez fest interrupted by clumsy ass Randy. Randy and Turk follow purser Kandi Barbour into the Jacuzzi and do her. That night there is a dance and Turk does Pam Jenning under the table. Meanwhile Randy is getting drunk and when Little Oral Annie does a strip he does to and is caught and thrown into the brig. Turk is taken by a group of girls: Linda Reeves, Kelly Nichols, Renee LaPaz, Dana Dennis and brunette. Then pirates board the ship in a plot with captain Cody Nicole to kidnap Sylvia Benedict. They start raping the women: Nicole Black + guy / Little Oral Annie + guy/ pirate captain RJReynolds + Cody Nicole. Turk frees Randy in the confusion and they take out the pirates one by one. Sylvia Benedict screws Turk as a reward for rescuing her. In the epilogue Loni and Kevin are reunited when the ship returns, and Randy West ends up as the ships captain to first mate Svetlana.

Oh Thanks, but it is not the one you mentioned.
But thanks anyway

Maybe Couples complaisantes. But I'm looking for that movie as well.