"If she's not single, then I had only one competition."?

Heard this somewhere online. Saying that if a guy chased a girl, he gotta face many competitions who were also after the same girl.

But if she's someone's girlfriend or wife already, then only one competitor.

I do know some guys like the taste of someone else's wives.

Do you agree with that statement? What's your opinion?
"If she's not single, then I had only one competition."?
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