Wonderboy said:
I think it's mainly genetics. Of course, there are variations and mutations so not every hung father will have a hung son. Likewise, some average to below average baby makers will produce well endowed sprogs
this is actually the most accurate post i have read so far about the subject....i think i mentioned it before that im a med student.....i have an extensive background in human bio and genetics
First penis size IS determined by genetics
Second penis size IS determined by environmental cues
Third penis size probably in some has to do with random mutations, variations, etc.....
There will not be a single "hung penis gene".....more than likely its a combination of many genes, probably tens to hundreds.....height, if i remember correctly is a random assortment of 7-20 different genes.....IQ is close to hundreds of different genes.....
more than likely most of the genes controlling penis size are not on the Y chromosome, its too small and its genes relatively non-complex, which means your mom carries genes that will affect the size of your penis.....so believe it or not penis size is probably controlled by the normal chromosomes and also some influence from X and others from Y.....however, if you look at many male characteristics theyre controlled by your mom's X chromosome (male pattern baldness for example).....so more than likely you have significant influence of your penis size from your mothers X chromosome and your dads Y chromosome pretty much turns on those genes
there will not be a simple answer to this question but you wont ever find a single gene
i always find it funny tho how guys talk about their dick bein from their dad when more than likely the influence is from your mother