[Verse 1: Perrie]
Does he tell you he loves you when you least expect it?
Does he flutter your heart when he kisses your neck?
No scientist or biology, it's obvious, when he's holding me
It's only natural that I'm so affected

[Pre-Chorus: Jade]
Oh, and my heart won't beat again
If I can't feel him in my veins
No need to question, I already know

[Chorus: All]
It's in his DNA
D-D-D-DNA, it's in his DNA
And he just takes my breath away
Bre-bre-bre-breath away
I feel it every day
And that's what makes a man not hard to understand
Perfect in every way, I see it in his face, nothing more to say
It's in his D-D-D-D-DNA

[Verse 2: Jesy, All]
It's the blue in his eyes that helps me see the future
Fingerprints that leave me covered for days, yeah, hey, yeah
Now, I don't have any first degree
But I know what he does to me
No need to work it out, it's so familiar, oh
[Pre-Chorus: Jade]
And my heart won't beat again
If I can't feel him in my veins
No need to question, I already know

[Chorus: All]
It's in his DNA
D-D-D-DNA, it's in his DNA
And he just takes my breath away
Bre-bre-bre-breath away
I feel it every day
And that's what makes a man, not hard to understand
Perfect in every way, I see it in his face, nothing more to say
It's in his D-D-D-D-DNA

[Bridge: Leigh-Anne, Leigh-Anne & Perrie]
It's all about his kiss, contaminates my lips
Our energy connects, it's simple genetics
I'm the X to his Y, it's the colour of his eyes
He can do no wrong, no, he don't need to try
Made from the best, he passes all the tests
Got my heart beating fast, it's cardiac arrest
He's from a different strain that science can't explain
I guess that's how he's made, in his D-D-DNA

[Breakdown: All]
(Ah-ah-ah-ah)
(Ah-ah-ah-ah)
(Ah-ah-ah-ah)
(Ah-ah-ah-ah)
[Chorus: All, Perrie, Jade]
It's in his DNA (Woah)
D-D-D-DNA, it's in his DNA
And he just takes my breath away
Bre-bre-bre-breath away (Bre-bre-bre-breath away, yeah)
I feel it every day
And that's what makes a man (What makes a man)
Not hard to understand (To understand)
Perfect in every way (In every way)
I see it in his face (It in his face)
Nothing more to say (Nothing more to say)
It's in his D-D-D-D-DNA