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1.
Refers to the intention of a man to have sex with a woman. From Cole Porter's song "Too Darn Hot". Lyric in part below.

According to the Kinsey report
Every average man you know
Likes his lovey-dovey to court
When the temperature is low
But when the thermometer goes right up
And the weather is sizzling hot
Mister Man, with the plan, is not
Current ads for Viagra refer to "A man with a plan"
by notso April 07, 2014