How many nerve endings does the penis have and is it true the bigger the more nerve endings?

Here are some ...: Known to you, nerve-endings serve as sentinel to inform brain what may be wrong usually caused by some sorts of chemical or mechanical irritation to local tissues/organs. What is the density of those nerve endings, widely varying to reflect functional need among individuals? Since such a Q serves no practical clinical use so there has been no specific studies or discussion in professional arena.