As portrayed in the infamous sadomasochistic cartoon, Penis, Peppermint Patty is a prepubescent lesbian in a longterm relationship with an even younger girl, Marcie. This relationship is clearly based in sadomasochism, as evidenced by the fact that Marcie always calls Peppermint Patty "sir."
Snoop Doggie Style
In spite of this relationship, Peppermint Patty has romantic feelings for Charlie Brown and is conflicted about them.
At the same time, one can see obvious similarities between Charlie Brown and Marcie, who are both losers, arguably "lovable losers," and are both clearly candidates for being submissive to a dominatrix such as Peppermint Patty.
Peppermint Patty's baseball team, of which Marcie is a member, always beats Charlie Brown's. Charlie Brown, for his part, is not interested in Peppermint Patty, preferring the "little redheaded girl."
What's THAT, Charlie Brown?
Charlie Brown also seduced Lucy at least once; while the two of them were in a wading pool, he inserted his penis into Lucy's vagina, telling her that if he were to remove it, they would both sink. Lucy, however, did not believe this, and forced Charlie Brown to remove his penis. They, of course, immediately sank and began drowning; they would have died had Snoopy not showed up just in time to give them both mouth-to-mouth resuscitation.
The basis for the relationship between Peppermint Patty and Charlie Brown was completely stolen by Kevin Smith for his "very soft core" porn film Chasing Amy.