Season 27, Episode 13: Love Is in the N2-O2-Ar-Co2-Ne-He-Ch4

1 Season 4, Episode 15: I Love Lisa
2 Season 6, Episode 7: Bart's Girlfriend
3 Season 8, Episode 19: Grade School Confidential
4 Season 9, Episode 25: Natural Born Kissers
5 Season 10, Episode 14: I'm with Cupid
6 Season 14, Episode 4: Large Marge
7 Season 14, Episode 17: Three Gays of the Condo
8 Season 15, Episode 20: The Way We Weren't
9 Season 19, Episode 12: Love, Springfieldian Style
10 Season 27, Episode 13: Love Is in the N2-O2-Ar-Co2-Ne-He-Ch4