One Woman Man是美国环球影业出品的爱情片《五十度黑》的原声音乐。该片2017年2月10日在美国上映，讲述格雷希望安娜重新回到他身边，而安娜也不再只是被动接受，她也提出了自己的要求。就在两人重新投入恋情中时，格雷过去生活中发生的事情，像阴影一样笼罩在他们头顶上。
另外，此曲由John Legend演唱。John Legend是一个学者型的灵魂乐歌者，他不仅只是一个歌手，更像是一个R&B音乐和灵魂乐的布道者，他与满大街的R&B和灵魂乐歌手的区别就在于，很多歌手可以因为R&B和灵魂乐风格不再时尚而转行，而John Legend却会守着这些传统一路坚持下去。
One Woman Man歌词：
I always believed that love will surrender
And I wouldn't go down without a fight
I always left room for other contenders
'Cause I might change my mind
Damn I used to be so cold
We never ever get too close
Didn't ever wanna lose control
But from the moment that I tasted
I knew that I would have to chase it
You say hold up I won't you to be
A one woman man
A one woman man oh
Want you all to my side
Don't want nobody else
Oh you love it
Oh you love it
Won't you be
A one woman man one woman
A one woman man oh one woman
You made me believe that love was forever
And love could sustain us through every fight
I'll let go of all of the other
Pretenders they'll be wasting my time
I never thought that I would say this
But I can see it haven Baby's
I can see it from the stars
That I might give you my heart
From the moment that I met you
Knew that I would never let you
Slip away it's okay
You can make me
A one woman man
A one woman man oh
Want you all to my side
Don't want nobody else
Oh my love it
Oh you love it
Won't you be
A one woman man one woman
A one woman man uh one woman
I can never say I loved you
I kept all my
But you broke in my house
You've stolen my heart
Now I'm giving you the key
That all of you for all of me
But baby I promise you'll be
A one woman man oh
Want you all to myself
Don't want nobody else
Oh I love it
Oh they love it
I can be
A one woman man one woman
A one woman man uh one woman
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