Is the sleeve jelly for this toy?

Perceptive forum discussions on Masturbator sleeves:

Bringing Up Penis Sleeves
I have recently begun to think it would be fun to try out some of the textured penis sleeves. Yet, I am hesitant to bring it up for fear that it will...

Do any of the Jopen key sleeves fit the We Vibe Salsa or Tango?
I would love to find a silicone sleeve to put over them.

Silicone Sleeve for Pump for Strap-On Sex?
Has anyone tried using this around a dildo in a harness, for a shortening effect on longer dildoes and/or to cover the O-ring and straps?

bullets and sleeves
never used a bullet before. Is slippage ever an issue? does the sleeve ever get over streched

Sleeves to practice oral sex for women?
I've heard some guys use the sleeves to practice oral sex on a woman. Guys have you?