The song If They Knew is performed by TLC in the album named FanMail in the year 1999 .
I don't know what she would do if she knew
That you were comin' to do what we do
I don't know what he would do if he knew
That you were comin' to do what we do
Always wondered if she knew about us
When I met ya you said ya'll had broke up
Right on time 'cuz I didn't have my love
Me and him was on some more stuff
That let me fall to you
And from what I could tell you fell too
And I wonder if it would be wrong
If we just kept it on
And I know, we both had someone that we just left from
They still think that they're the only ones
I like the way we hang but it ain't been long
We know the feelings ain't all gone
I don't know what she would do if she knew
That you were comin' to do what we do
I don't know what he would do if he knew
That you were comin' to do what we do
Always thought that he knew about you
When I met you I said, "We were through"
In time my feelings came right back
But I didn't let us get off track
And I got so into you
Way too fast what do I do
And I know I shoulda held it off
But you just turn me on
And I know, we both had someone that we just left from
They still think that they're the only ones
I like the way we hang but it ain't been long
We know the feelings they don't know
I don't know what she would do if she knew
That you were comin' to do what we do
I don't know what he would do if he knew
That you were comin' to do what we do
We kept things pretty tight this far
Love without the s*x and hundred thousand dollar cars
Ain't it funny how our aura's unify
An entity upon itself that can spread wings and fly
A peaceful co-existence that will surely last
Becomes a reminiscent dream for those in our past
If they knew just a fraction of all the things we do
They still wouldn't comprehend the depth between me and you
And I know, we both had someone that we just left from
They still think that they're the only ones
I like the way we hang but it ain't been long
We know the feelings they don't know
I don't know what she would do if she knew
That you were comin' to do what we do
I don't know what he would do if he knew
That you were comin' to do what we do
I don't know what
She would do if she knew
I don't know what
He would do if he knew
I don't know, don't know, don't know
Yeah baby I
I don't know, don't know
Don't know, I