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Why does the masturbation cup produce oil? Detailed explanation of causes and solutions

Written by: Bestvibe Published on August 13,2025

Preface

Many male friends who buy a new masturbation cup have the same question: why does oil appear on the surface of the cup shortly after opening it? Is there something wrong with the product?

In fact, this phenomenon is very common in sex toys, especially TPE masturbation cups. Today, we will discuss the causes, prevention methods, and how to properly maintain them.

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Common Materials Used in Masturbation Cups and the Characteristics of TPE

Most male sex toys on the market, such as masturbation cups, realistic butts, and pocket pussies, are made from two primary materials: TPE (thermoplastic elastomer) and silicone.

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  • TPE Material: Soft, highly elastic, with a texture similar to human skin, and strong stretchability, it can create more realistic internal channel structures, making it the preferred material for most mid-to-high-end masturbation cups.
  • Silicone Material: Heat-resistant, corrosion-resistant, and less prone to oil leakage, but its texture and softness do not match those of TPE.

One characteristic of TPE is that during production, a certain proportion of oils and softeners are added to make the material softer and more skin-like in texture.

Therefore, during use or storage, oil may gradually seep out from the surface of the masturbation cup, which is referred to as oil leakage.

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Why does the TPE masturbation cup release oil?

The main reasons for the masturbation cup releasing oil are as follows:

Material properties

TPE is made by mixing oils and elastomers.

Over time, especially with prolonged storage or frequent use, the oily components inside may slowly migrate to the surface.

This is a normal phenomenon and does not indicate poor product quality.

Masturbation Cup

Production Process Additives

During manufacturing, lubricating additives are added to make the surface of the sex toy smoother, reduce friction, and slow down material aging.

These additives may also gradually seep out over time.

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Storage Environment

If the masturbation cup is stored for an extended period in high-temperature, humid, or direct sunlight environments, the material will age more quickly, and the oil leakage will become more noticeable.

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Usage and Cleaning Habits

If not cleaned promptly after use, residual lubricant, bodily fluids, or dust may mix with the oil on the TPE surface, appearing as an oily film.

Additionally, different brands and models of masturbation cups may exhibit varying degrees of oil seepage due to differences in formulation and manufacturing processes.

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How to reduce oil leakage from masturbation cups?

Although oil leakage from TPE material is a normal phenomenon, we can reduce its impact through proper storage and maintenance.

Storage Methods

Avoid tightly wrapping the masturbation cup in a plastic bag or leaving it in a confined space for extended periods.

It is recommended to store it flat in a clean box or drawer to ensure proper ventilation.

For added privacy, consider using a locked metal box for storage, which is both dust-proof and secure.

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Cleaning Methods

Clean it promptly after each use to prevent residue from affecting the material.

Use warm water and a neutral detergent (such as a specialized cleaning solution). Avoid using alcohol, 84 disinfectant, hand soap, or shampoo, as these ingredients can damage the TPE structure, causing the material to harden or crack.

After cleaning, gently blot dry with a clean towel and allow it to air dry naturally to ensure no moisture remains inside.

Regular Maintenance

Purchase a maintenance powder specifically designed for TPE materials, which helps control oil, prevent stickiness, and repel dust, while also extending the lifespan of the masturbation cup.

After the surface becomes oily or after cleaning and drying, lightly sprinkle a layer of maintenance powder and evenly apply it with your hands.

If oiling is particularly severe, it indicates significant material aging, and it is recommended to replace the product with a new one.

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When should you replace your masturbation cup?

Although masturbation cups can last a long time with proper cleaning and maintenance, it is best to replace them immediately in the following situations:

  • The cup has hardened and lost its elasticity.
  • The internal structure is damaged or cracked.
  • There is an unpleasant odor that cannot be removed even after cleaning.
  • There is excessive oil secretion, affecting the user experience.

Remember, sex toys are personal items. For safety and optimal experience, it is necessary to replace aged products promptly.

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Summary

Oil leakage from TPE-material masturbation cups is a normal phenomenon caused by a combination of material properties and usage environment.

As long as they are stored properly, cleaned promptly, and maintained with care powder, their lifespan can be significantly extended. 

When selecting sex toys, men should not dismiss the advantages of TPE material solely because of oil leakage. Its softness and realistic feel remain the top choice for many users.

If oil leakage affects your experience, simply replace it with a new one to ensure a more comfortable and reassuring usage experience.  

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