It's what's called a male pornographic fantasy.
4 seconds sound clip from the Dazed and Confused (1993) movie soundboard.
You can hear this line at 00:07:59 in the Blu-ray version of the movie.
Quote context
[...]
- What in the hell are you talking about, girl?
- You weren't thinking about it, were you?
- It's what's called a male pornographic fantasy.
- Oh, my!
- You're basically alone on a deserted island with two readily available women.
- One, a seductive sex goddess type. The other, a healthy girl-next-door type with a nice butt.
- So guys have it all. The Madonna and the whore.
[...]