I can't explain it any better than that.

5 seconds sound clip from the McLintock! (1963) movie soundboard.

You can hear this line at 01:21:11 in the Blu-ray version of the movie.

Quote context

[...]

- Some folks are going to say I'm doing all this so I can sit up in the hereafter and look down on a park named after me...

- Or that I was disappointed in you, didn't want you to get all that money.

- But the real reason, Becky, is because I love you...

- And I want you and some young man to have what I had...

- All the gold in the United States Treasury and all the harp music in heaven can't equal what happens between a man and a woman with all that growing together.

- I can't explain it any better than that.

- All right, Daddy.

- Becky!

- When you're as old as I am, you'll thank me for this.

- Daddy, I'm full-grown.

[...]