Is 18cm Penis considered as big?

1. Summary of the results

Based on the scientific analyses provided, an 18cm penis is considered above average to large compared to global measurements. The research shows significant variation in average penis size across different studies and populations:

• A systematic review found the global mean stretched penile length is 12.84 cm, with Americans having the largest average at 14.47 cm ^[1]
• Wikipedia cites a 2015 systematic review showing average erect length of 13.12 cm, with 45% of erect penises measuring between 12-14 cm ^[2]
• Studies from specific populations show similar patterns: Egyptian men averaged 12.9 cm (range 5-19 cm) ^[3], while Turkish men averaged 13.7 cm with a standard deviation of 1.6 cm ^[4]

However, one Italian study found a notably higher mean erect length of 16.78 cm with a standard deviation of 2.55 cm, suggesting 18cm would be only slightly above average in that population ^[5]. An American study reported an average of 13.5 cm (5.3 inches), with 68% of men measuring between 11.7-15.2 cm ^[6].

2. Missing context/alternative viewpoints

The original question lacks several important contextual factors that scientific research has identified:

• Measurement methodology matters significantly - studies use different techniques (stretched vs. erect, self-reported vs. clinically measured) which can affect results
• Geographic and ethnic variations are substantial - the analyses show different populations have different average sizes, with Americans showing larger averages than other regions ^[1]
• Female preferences emphasize different factors - research indicates that 45 out of 50 women reported width as more important than length for sexual satisfaction ^[7], and only 21% of women rated length as important while 33% rated girth as important ^[8]
• The question of "big" is relative - what constitutes "big" depends on the reference population and context

3. Potential misinformation/bias in the original statement

The original question, while straightforward, contains an implicit assumption that may reflect common misconceptions:

• The focus solely on length ignores scientific evidence showing that width/girth is more important for sexual satisfaction according to female survey data ^{[7] [8]}
• The question lacks context about measurement standards - different studies use different methodologies, and the analyses show this can significantly impact results
• There's an implicit assumption of a universal standard when research clearly shows significant geographic and population variations in average sizes ^{[1] [3] [4]}

The question itself doesn't contain explicit misinformation, but it reflects a common oversimplification of how penis size is evaluated both scientifically and in terms of sexual satisfaction.