Most dildo guides on this site cover shape, size, and material across the category generally. This one is about a specific type within that category — double-ended dildos (often called "double dongs") — which work differently enough in practice to need their own explanation.
What they are, and what they're for
A double-ended dildo has a usable shaft at both ends rather than a base at one end and a shaft at the other. This means they're designed either for two people to use at the same time, or for one person to use both ends in different ways (vaginal and anal simultaneously, for example). The length varies significantly across models — some are long enough for two people to comfortably share from opposite ends, others are shorter and better suited to solo use.
The main types
Straight double-ended
The same shaft shape on both ends, usually symmetrical. The simplest design, and the most versatile since either end works the same way. Most models in this category are flexible rather than rigid, since rigid dual penetration on a straight shaft would be genuinely uncomfortable in most positions.
Curved or angled double-ended
One or both ends are angled rather than straight, designed to reach specific internal angles (G-spot or prostate, typically) when both ends are in use. Less versatile than a straight model since the angles are built for one specific type of use, but more targeted if you know that's what you want.
U-shaped or strapless strap-ons
A short double-ended design where one end is held internally by one partner and the other end penetrates the other partner, without a harness. Marketed as "strapless strap-ons," though in practice most people find they still need a hand to stabilize it during use, so the strapless claim is optimistic. A different use case from a long double-ended dildo — same category on paper, different function in practice.
Dual-density or realistic
Built with a softer outer layer over a firmer core, or textured to look and feel more realistic. Materials and cleaning matter more here — dual-density designs often use porous materials that are harder to clean fully, so check what you're getting before buying based on texture alone.
Solo use vs partnered use
A long double-ended dildo can be used solo (one end in each orifice, or one end held in place while the other is controlled by hand), but the length means it's designed primarily with partnered use in mind. Shorter double-ended toys or U-shaped designs are more practical for solo use since they don't require the reach or flexibility a long shaft does.
For partnered use, communication about depth and speed matters more than with a standard dildo, since both people are feeling the movement at the same time and neither has full independent control unless one end is handheld.
Materials and cleaning
Silicone is the safest choice here for the same reasons it is everywhere else — non-porous, body-safe, and easy to clean properly. Some double-ended dildos are sold in PVC, jelly, or blended materials, which are porous and can't be fully sterilized between orifices or between partners. If you're planning to use both ends (especially in different orifices), material choice matters more than it does with a single-ended toy you can clean in between uses.
Use water-based lubricant generously on both ends — this isn't a category where you can get away with less, since two points of contact means twice the friction to account for.
Where to start if you're genuinely unsure
A medium-length straight double-ended dildo in body-safe silicone is the most versatile first purchase — long enough to work for partnered use if that's what you want, flexible enough to work solo if you change your mind, and simple enough that you're not committing to a specific curve or angle before you know what actually works for your body.
Browse the full range in Double Dongs. For general dildo sizing and material advice, see How to Choose the Right Dildo Size for Your Body and Silicone vs Glass Dildos: Which Material Is Better for You?. For dual penetration generally (with separate toys rather than one double-ended model), start with Beginner's Guide to Anal Play: How to Start Safely and Comfortably. For cleaning any multi-orifice toy properly, read How to Clean, Store, and Care for Your Adult Toys the Right Way.