from a biological standpoint, the main difference boils down to the elasticity of the tunica albuginea—the fibrous sheath around the erectile tissue—with growers having a thinner, more elastic version that allows for greater expansion during arousal, while showers have a thicker one leading to less change in size. genetics and factors like overall health (e.g., conditions affecting blood flow) play key roles, with studies showing about 26% of men are growers. evolutionarily, there's no clear consensus, but theories suggest showers may have had a sexual selection edge in ancestral times for appearing larger when flaccid, while growers could offer protection from injury; however, no strong reproductive advantage is proven.
insidehook
https://www.insidehook.com/sex-and-dating/science-behind-grower-shower
renamalikmd
https://renamalikmd.com/genetics-environment-determining-grower-vs-shower-status/
biologyinsights
https://biologyinsights.com/growers-vs-showers-the-biological-difference/
reddit
https://www.reddit.com/r/AskScienceDiscussion/comments/3ux0lr/what_is_the_evolutionary_purpose_of_grower_vs/
