How big is too big? Functional dimensions of bestselling insertive sex toys to guide maximal neophallus dimensions

In our practice we have encountered multiple female-to-male transgender patients seeking neophallus revision surgery for excessive girth which precludes penetrative intercourse. There is little evidence available to guide... [ view full abstract ]

In our practice we have encountered multiple female-to-male transgender patients seeking neophallus revision surgery for excessive girth which precludes penetrative intercourse.
There is little evidence available to guide transitioning patients or their surgeons regarding suitable neophallus dimensions, and poor evidence on receptive size preference overall.
In this study, we assess the dimensions of sex toys designed for insertive marketed by leading U.S. vendors. As a proxy for mean and maximal neophallus dimensions, we assess the mean and upper-limit dimensions of insertive sex toys for sale to the U.S. public by these leading vendors.

We aim to assess the length and circumference of bestselling realistic dildos, and then compare these to published erect cis-gender penile dimensions, for the following purposes: 1. To see how the mean length and girth of... [ view full abstract ]

We aim to assess the length and circumference of bestselling realistic dildos, and then compare these to published erect cis-gender penile dimensions, for the following purposes: 1. To see how the mean length and girth of best-selling insertable sex toys compares to cis-gender erect penile dimensions; and 2. To use the upper-limit of best-selling insertable sex toy dimensions as a proxy to define maximal "upper limit" for neophallus girth compatible with insertive intercourse for cis-gender receptive sexual partners.

We collected reported measurements for “realistic dildos” designated as bestsellers for the top five Alexa.com-rated online adult retailers in the United States and for Amazon.com. We compared these with in-person... [ view full abstract ]

We collected reported measurements for “realistic dildos” designated as bestsellers for the top five Alexa.com-rated online adult retailers in the United States and for Amazon.com. We compared these with in-person measurements of dildos available at Good Vibrations in San Francisco (USA).

Main outcome measures: Average length and circumference of overall bestselling and top-three largest bestselling realistic dildos as reported on top websites and measured in person by investigators. [ view full abstract ]

Main outcome measures: Average length and circumference of overall bestselling and top-three largest bestselling realistic dildos as reported on top websites and measured in person by investigators.

While the insertive length of all of these compiled sex toys is one standard deviation greater than functional erect penile length as reported in the literature, their average circumference was quite close to mean reported... [ view full abstract ]

While the insertive length of all of these compiled sex toys is one standard deviation greater than functional erect penile length as reported in the literature, their average circumference was quite close to mean reported natal girth.

We suggest that a reasonable maximal neophallus girth after insertion of an inflatable penile prosthesis is 15.1 cm in circumference (=2 standard deviations greater than the mean reported natal erect penile girth (11.5 cm... [ view full abstract ]

We suggest that a reasonable maximal neophallus girth after insertion of an inflatable penile prosthesis is 15.1 cm in circumference (=2 standard deviations greater than the mean reported natal erect penile girth (11.5 cm [SD=1.7] to 12.3 cm [12.3].
Girth greater than this could lead to difficulty in penetrative intercourse for many sexual partners. A more conservative guideline is 13-14 cm, or 0.5-1.5 SD greater than natal girth.