in order to love his wife, a man must have affairs.

Here are a couple of ideas.

After having an affair with his boss, a jaded accountant discovers a new found love for his wife, but to keep the spark in his marriage alive, he must become a serial cheater.?

Or

After having an affair with his boss, a jaded accountant discovers a new found love for his wife, but to keep the spark in his marriage alive, must he become a serial cheater??

Re: Tony Edward's logline:
I think it does the job. The paradoxical dilemma the philandering man discovers IS the dramatic problem. That's what happens in relationships: people find themselves having to juggle conflicting desires and demands. The conflict is primarily internal: the guy is his own worst enemy, his own antagonist.

Re: Tony Edward's logline:
I think it does the job. The paradoxical dilemma the philandering man discovers IS the dramatic problem. That's what happens in relationships: people find themselves having to juggle conflicting desires and demands. The conflict is primarily internal: the guy is his own worst enemy, his own antagonist.

Yep... That was a tad harsh (one of those days..).

The concept does present the potential for an interesting dilemma -- but as others have said, focus on being specific with your lead character and what they HAVE to do. Below is really only an extension of your concept and not really great as a logline, but anywho:

"After having an affair with his boss, a jaded accountant discovers a new found love for his wife, but to keep the spark in his marriage alive must become a serial cheater."

Best of luck.

Hi, everyone, Thank you very much for your comment. They are very helpful and inspirational to me. I will try to work out a real logline and post it later.

Please excuse for my English since it is not my first language.

It's not a 'logline' but it gets the attention. What kind of loser is this 'man'? Either he is a complete nobody or he has serious issues that prevent him from having a relationship with his wife. Or, perhaps is wife is the weird one, in which case he needs to find a way to leave her. I think once you have a better idea of what is going on here you will be able to write a logline. When ... something happens ... to the flawed protagonist ... he will have to dig deep ... to overcome his affliction ... and find happiness (achieve his goal). What is his goal?

Good point.

If he makes it a comedy the idea will seem a little close to Hall Pass where the fire has gone out of the marriage and in order to get it back the wife gives the husband a "Hall Pass" to have an affair.

This is not a logline.

If you make it a comedy, you would have a wide audience.

I'm not really fussed that you haven't capitalised the first word in your sentence - it's not really important at this stage of your logline's development - but I am fussed that your logline is not a logline.

"in order to love his wife, a man must have affairs" hardly gets my attention because, most importantly, there's nothing exceptional or unique about an adulterous man; it happens all the time and is an accepted norm of society. What makes their relationship unique? What makes his affair, and his motivation to have an affair, original?

You need to get to the heart of your story and answer the following questions:
1) who's the protagonist?
2) what's the protagonist's flaw?
3) what is the protagonist's goal?
4) who or what is stopping the protagonist from achieving that goal?
5) what will the protagonist lose if he/she fails to achieve that goal?

When you can supply solid answers to these questions, then you can fashion them into a great logline.

Good luck ;-)

Well, it's an interesting situation. Now what's the plot? What happens when the wife finds out? (She is going to find out -- isn't she?)