Dorothy and Blanche's roleplaying in "Forgive Me, Father". Justified in that Blanche is trying to show Dorothy how to ask a man to dinner.
Also, sort of demonstrated here in an episode where Rose and Blanche have joined a dirty dancing class.
One of Dorothy's friends falls in love with Rose and confesses to her.
When Blanche and Dorothy pretend to be a couple.
Blanche makes Rose double date with her on New Year's Eve because she thinks she'll have bad luck if she doesn't get kissed at midnight. After the dates go bad and the men leave, Blanche looks like she is considering kissing Rose, who quickly says "Don't even think about it".