Here is a subject often debated here on LPSG site *cough-cough*.
I thought this site had some nice info.
http://www.penissizedebate.com/contents.htm
edit: this page
http://www.penissizedebate.com/page39_vaginal-response.htm
I thought this site had some nice info.
http://www.penissizedebate.com/contents.htm
edit: this page
http://www.penissizedebate.com/page39_vaginal-response.htm