A question that every good tailor should ask, this refers to the side the customer's penis usually leans. The tailor will then make the corresponding pant legs a little bit looser. 1.5 inches is the usual amount, according to teleny.
LeoDV tells me that the scrotum's attitude is the variable here, not that of the penis. Since the whole concept of pants is incompatible with penises and scrotums in general, what's the difference?