Why is it lazy, though? If thats what sells, its not lazy, it smart. If you want to make money, you write a movie that is going to make money. If you're in it for the artistic aspect, then you don't have to make decisions about money.
Don't act like its a new thing though. Two of my favorite movies of all time and two of the best comedies of all time are Blazing Saddles and Airplane. Blazing Saddles has an entire scene devoted to a fart joke, jokes about rape, racism and all kinds of outrageous stuff, but its done well. Airplane has topless women, human excrement, drug use, allusions to pedophilia, abortion.
The fart scene in Blazing Saddles is far and away the least amusing scene in one of the funniest movies of all time.