Fleshlight Review: Stamina Training Unit (STU)

The Fleshlight STU, or Stamina Training Unit, is designed specifically to overstimulate the penis, with the aim of helping the user improve his sexual stamina and last longer in bed. It is recommended to men who would like to learn to control their ejaculation, or those who prefer a very intense Fleshlight.

Fleshlight Mini Lotus
The most realistic Fleshlight

Stamina Training Unit
Specifically designed to improve sexual endurance.

Stamina Training Unit Review

Sleeve and Texture

Fleshlight Stamina Training Unit - STU

The STU is available with a choice of the ‘Lady’ pussy orifice or, for those who prefer to keep it simple, the simple ‘Pure’ hole which does not attempt to imitate a real orifice.

The sleeve is fairly simple in design, with just one texture and a regular width all along the canal. It is one of the tighter Fleshlight sleeves, with a width of approximately 0.6” (15mm), and is lined along the whole length with rounded, raised bumps.

These bumps are densely packed and surround the penis on all sides. Once you are inside the sleeve, there is simply no escape from them.


Romi Rain Storm
  • Five distinct sections offer a variety of stimulating surfaces, including small bumps, dense ridges and tight constrictions.
Stoya Destroya
  • If you’re looking for a very intense sleeve with a crazy, non-realistic texture, the Destroya is one of the best choices
Stamina Training Unit
  • Specifically designed to improve sexual endurance.

How the STU Feels

As the name suggests, the STU is very, very stimulating. The bumps surround the penis from all sides, and all along the length, so the stimulation is continuous and never lets up at all. It’s like a massage from all sides at once, with tiny pressure points that become more and more pronounced as you move towards orgasm.

I could not last long in this sleeve; it was too stimulating. The orgasm was great but it all felt a little too fast and intense.

This Fleshlight was designed for a purpose, and I’m convinced that it would help a great deal with increasing sexual stamina and reducing premature ejaculation. If you are using this sleeve for this reason then you will need to stop and start a lot in order to control your orgasm – it really is that stimulating. By using it regularly, gradually increasing the amount of strokes and perhaps withdrawing before ejaculation, I’m sure that it would make longer lasting real sex a lot easier.

Fleshlight Stamina Training Unit (STU) texture

Fleshlight STU Texture

However, as a masturbation sleeve I found it a bit too intense. With this dense bumpy texture there is no room for a long, slow build up and, post orgasm, it is over-stimulating to the point of being almost painful. Definitely fun to try but it will not be a regular use sleeve for me.


The densely packed bumps mean that this sleeve needs to be carefully cleaned to remove any leftover lube. Fast running water, run through both ends of the sleeve, should suffice. You could also fill the sleeve with clean water, covering the ends with your fingers, and swish it around to remove any stubborn residue. Dry in a warm spot (never directly on top of a radiator) for several hours before putting your Fleshlight away.







How I rate Fleshlights explained

This Fleshlight is made to overstimulate: ideal if you want to learn control and improve your sexual staying power but less so if you are looking for a fun masturbation sleeve for regular use.

What comes to training your sexual stamina, STU works but it’s also a kind of marketing gimmick as any Fleshlight masturbator will improve your stamina if you’re able to stay in control and stop when getting too close to ejaculation (see my recommendations for the best stamina training Fleshlights).

Stamina Training Unit
Specifically designed to improve sexual endurance.

If you love the Stamina Training Unit then why not try one of the following?

Autumn Falls Cream Fleshlight's intense textures create a strong pressure-release sensation which delivers one of the best Fleshlight orgasms ever. Read my Autumn Falls Cream review.

Find out what are the top intense Fleshlight textures in the Complete Guide to Fleshlights (TIP: Kissa Sins Insatiable is fantastic!).

Disclosure: Please note that some of the links above are affiliate links, and at no additional cost to you, I will earn a commission if you decide to make a purchase. If you click an affiliate link and make a purchase, you help support this website. Please note that: 1) I do not and will not recommend a product just because I’m an affiliate. 2) I do not recommend products just for the sake of making money. 3) I recommend products because I think they are valuable to my readers. 4) I respect and value my readers too much to write anything other than my own genuine and objective opinions and advice.

Great Intense Fleshlights

Kissa Sins Insatiable – New Queen of Fleshlights: The Insatiable is her signature pussy Fleshlight. The sleeve is super intense without being over-stimulating, the varied textures of the Insatiable deliver mind-blowing orgasms every time. Read Kissa Sins Insatiable Fleshlight review.

Stoya Destroya - The Classic Intense Fleshlight: The Destroya is one of the most intense Fleshlights. It isn’t for the faint of heart but if you like intense sensations, read my review. Read Stoya Destroya Fleshlight review.

Turbo Thrust - Intense Blowjob Fleshlight: The distinctive three-part entrance of the Thrust provides the most realistic imitation of oral sex I have even experienced and its tight, stimulating inner texture is better than the best deep-throat. Read Turbo Thrust review.

Stamina Training Unit - STU: The STU is specifically designed to improve stamina. The texture is densely spaced rounded bumps in a relatively tight sleeve and it is very, very stimulating. Read Stamina Training Unit review.

Elsa Jean Tasty – Intense, Tight Fleshlight: The Tasty has a really unique combination of textures which add up to something pretty special and deliver some seriously powerful sensations. Read Elsa Jean Tasty review.

Go Surge - Great and Compact Fleshlight: A smaller and cheaper Fleshlight model, the Go Surge has an intense texture of small ribs and perfectly placed bumps. Read Go Surge review.