This masturbator is the tightest I've tried yet (http://www.orgasmarmy.com/male-toys/magic-pearls-sleeve/reviews.aspx, Senso Sapphire). It takes a strong erection and a decent amount of lube to be able to penetrate this toy. In order of 'tightness', I'd rank this the tightest followed by the magic pearls, followed by the Senso Sapphire. I think the industry needs to stark ranking their masturbators in terms of tightness, etc. Like a lot of masturbators that I've used, this one does require a steady stream of lube for extended (10+ minutes) masturbating sessions, so keep that in mind when deciding which size bottle of lube to purchase.