Suck on memes

Why do four polish heteroflexable men like to suck on four of the cow's udders? Because a bull has only one.

Two homeless alcoholics want to get drunk but don't have enough money for even the cheapest drinks in any bar. So one of them devises a clever plan: he tells his friend, "We should buy a hot-dog sausage with the last of our money and stick it down my pants, then drink a load of drinks. But then when the bill comes, you get down and suck on the hot-dog, and it'll look like you're sucking on my dick. So then we'll get thrown out without paying, and we can just go to another bar and do the same thing again."

His friend agrees, so they buy the hot-dog, stick it down the first dude's pants, go to the bar, and then the second dude begins to suck on the hot-dog as agreed. They are thrown out and hit another four bars this way. In the end, as they lie drunk on the floor in some alleyway, the second guy says, "Well, what a great night. Free beers in five different bars!" The first guy says, "Yeah! Especially since the hot-dog fell out before we even reached the first bar!"

For some reason, when my mom eats hot dogs, she likes to lick and suck on it first. As a son, can anyone tell me why?