As for your first question, I don't know

but the second one, I think the answer is yes, but don't over do it. You don't have to be peeing to exercise that muscle and i've heard that it will help to hold it in later. But just like any muscle, if you over do it, you can tear the muscle tissue. So, don't do it to the point of pain. Exercise is regularly but not for excessive amounts of time. Girls have a similar muscle and they exercise this in order to strengthen the muscle for after giving birth. Otherwise, wetting their pants is common because during birth they completed tore apart the muscle that holds in urine. Maybe that was too much info.

the stuff you see at the end of you penis is smeg look it up in the dictionary