I'm posting a little project I've started and thought I'd post what I've got so far. My main project will end up being an animation of how PIV sex probably looks like based on data, studies and experiments done. I'm far from being done, but I thought this first segment interesting enough to merit it's own topic. I've created a drawing (to scale) everything I have on male and female genitalia. My motivation here is to quantify exactly why guys who boast about being long enough to hit a woman's cervix is absolute bullshit. This first frame shows the penis and vagina dimensioned as accurately as I can: http://s3.amazonaws.com/data.tumblr.com/tumblr_lzbffhPs3C1roy9v5o1_1280.jpg?AWSAccessKeyId=AKIAJ6IHWSU3BX3X7X3Q&Expires=1329196456&Signature=xS8XT884dKaNfmvaF2byKLFEEdE%3D The second frame shows what happens when the penis is 2 inches inside: http://s3.amazonaws.com/data.tumblr...196504&Signature=5zzqsMh2FBqFqBoK5ks2+KWPt2I= This one is 4 inches inside: http://s3.amazonaws.com/data.tumblr...197797&Signature=w/8fYzx4Jwat4sA2YMr+RfwxboE= This one is 6 inches in: http://s3.amazonaws.com/data.tumblr...197821&Signature=WKvw8Wg3ieFh8j9FFAK+Wtgm0d8= And finally, balls deep: http://s3.amazonaws.com/data.tumblr...197858&Signature=EWSTBe3CWeUnhgiXz6DL6Aaot50= Hopefully this explains clearly enough. If anyone has any comments or criticisms, please be as brutal as possible. This is the start of a massive project I've been wanting to do for years. Footnote: If you're curious, the data on vaginal internal dimensions are based on: http://humrep.oxfordjournals.org/content/21/6/1618.full The original model for the vagina's cross section is from: http://www.daviddarling.info/images/vagina.gif The cross section of what coitus looks like: http://www.e-radiography.net/articles/MRI Intercourse_files/MRI Intercourse.htm How a tented vagina looks like: http://www.the-clitoris.com/x/orgasm/respon2.jpg And finally, the penis was traced from a photograph.