That's because no stewardess would have him.
4 seconds sound clip from the Major League (1989) movie soundboard.
You can hear this line at 00:40:54 in the Blu-ray version of the movie.
Quote context
[...]
- I'll bet what's-his-name at the restaurant read it.
- Tom. His name's Tom, and keep your voice down.
- What do you see in this guy?
- Well, he's stable, intelligent, and I never found him in bed with a stewardess.
- That's because no stewardess would have him.
- Hey, wouldn't you rather be with someone who's in demand?
- Tom and I are getting married in the fall.
- Oh, God, Lynn, that's crazy. I had plans for us.
[...]