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

[Pre-Chorus: Jade, All]
Oh, and my heart won't beat again (Ooh)
If I can't feel him in my veins (Ooh)
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, yeah

[Verse 2: Jesy, All]
It's the blue in his eyes that helps me see the future (Mmm)
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 (No), oh, woah (Woah)
[Pre-Chorus: Jade, All]
And my heart won't beat again (Ooh)
If I can't feel him in my veins (Ooh)
No need to question, I already know (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, yeah

[Interlude: All]
It's in his DNA, in his, in his DNA
It's in his DNA, D-D-D-D-DNA
It's in his DNA, in his, in his DNA
It's in his DNA, D-D-D-D-DNA

[Bridge: Leigh-Anne, All]
It's all about his kiss, contaminates my lips (Ooh-ah, ooh-ah)
Our energy connects, it's simple genetics (Ooh)
I'm the X to his Y, it's the colour of his eyes (Ooh-ah, ooh-ah)
He can do no wrong, no, he don't need to try (Ooh)
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
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, yeah