Studies have found that larger penises do not displace other sperm more effectively than smaller penises, but rather longer penises may ejaculate sperm inside the vagina in places that would be harder for a following penis to displace.
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The study ranked 113 nationalities, and while I couldn't find the full list to tell you exactly where our American men placed on the size scale, they weren't at the top.
(mh=ksoXJt8V5JEszvOa)14.jpg "Penis arab Circumcision Picture")
