Hi everyone. I'm looking for this movie - not exactly erotic but it does revolve around sex.
This is probably a spanish movie, about a married couple who has sexual problems.
The woman is in pain during penetration and they are both frustrated and spiteful because of it. Their son is left somewhat alone with his issues (he's young, probably less than 13).

Some scenes I remember:
The wife catches her husband masturbate in the shower and shouts at him.
The wife goes to a gynecologist who says there is nothing wrong with her, all she needs is a little lubrication.
The wife uses a cucumber to masturbate in the kitchen.
The couple host a young attractive female relative, whom I think the husband later has sex with.
And the happy ending: the couple are having sex and sounds like they are liking it. The son is using the lubricant the wife got from the gynecologist as glue.

Besides all the sex I remember it was a really good humored movie about martial and sexual problems and it is important for me to find it and show my spouse.
Thanks for help!