[s8e14] Ring Up -

: Robin struggles to adjust to wearing her engagement ring. She realizes that the "bling" makes her invisible to other men, meaning she no longer receives the free drinks and special treatment she was accustomed to.

: Marshall begins wearing a leather cuff (which belonged to Ted) because it unexpectedly turns Lily on. Despite the cuff causing his wrist to swell and smell, he continues wearing it for the sake of their love life until Lily admits she doesn't actually need it to be attracted to him.

For more details, you can check the episode's entry on Wikipedia or its IMDb page .