A pen pal who you are sexually involved or have romantic intentions for. The content of the letters may be conveying romantic feelings or sexual desires ("i.e. Benefits").
Johnathan and I became pen pals with benefits after our one night stand.

There was this guy who I hooked up with, and I really wished we had stayed in touch and had been pen pals with benefits.
by katielouhue December 14, 2009
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