how to predict a guy's size?

TLDR: Predicting a man's size, whether for clothing or physical attributes, relies on accurate measurements and an understanding of sizing systems. For clothing, precise measurements are essential, while unconventional methods for predicting penis size, like the 2D:4D ratio, lack definitive scientific support.

Predicting a man's size involves accurate measurements and a grasp of various sizing systems. For clothing, precise measurements such as chest, waist, hips, and inseam are crucial to ensure a proper fit, especially for tailored items. Tools like measuring tapes and techniques for taking measurements over underwear are recommended to achieve accuracy. Understanding the different sizing systems—numerical, lettered, and alpha—is also essential, as they can vary significantly between brands.

When it comes to predicting physical attributes like penis size, methods such as the 2D:4D ratio (comparing finger lengths) have been proposed, but they are not scientifically definitive. Apps like "The Predicktor" attempt to estimate size based on personal statistics, but they should be viewed as general guides rather than precise tools. Overall, while there are methods to predict size, accurate measurements and a critical approach to unconventional methods remain the most reliable strategies.